“A Voice from the Tomb”: The Catalpa Rescue at 150

April 17-19, 2026, marks 150 years of one of the most daring episodes in Irish revolutionary history – the Catalpa Rescue. In a meticulously planned transnational operation, six Fenian political prisoners broke out of the British colonial gaol in Fremantle, and took a whaling ship to the United States. The escape immediately became a powerful symbol of Irish republicanism, and cemented the vital role of the Irish diaspora in the struggle for Irish freedom.

 

In April 1876, on a lonely stretch of Western Australian coast, six Irishmen and their rescuers fled across the sand. Behind them loomed the stone walls of Fremantle Prison – “the Establishment,” a place they had come to refer to as a tomb for the living. Ahead lay the open ocean – and the hope of rescue on an American whaling ship, the Catalpa, waiting just beyond the horizon.

 

Their escape, begun on Easter Monday, 17 April 1876, and culminating in a dramatic confrontation on the high seas two days later, would become one of the most audacious rescue operations in modern history. Yet the Catalpa Rescue was no mere escape: it was a carefully orchestrated act of political defiance, a demonstration of transnational Irish resistance, and a propaganda triumph that reverberated across continents and centuries.

 

One hundred and fifty years later, its significance lies not only in the freedom of six men, but in what it signalled to their peers and adversaries on both sides of the Atlantic: that Irish republicanism, though suppressed at home, had taken root abroad, and that this exiled rootstock could strike – even under the very noses of the British Empire – anywhere in the world.

 

Fenians: Soldiers, Rebels, Exiles

 

In a manner all-too familiar to the Irish republican movement, this story begins in storied failure: the Fenian Rising of 1867. Planned and organised by the Irish Republican Brotherhood, the rising collapsed under pressure from informers, arrests, and overwhelming British force. In the lead-up to the rising, the Fenian Brotherhood had pursued a bold and dangerous strategy: infiltrating the British Army. As thousands of Irishmen serving Britain abroad returned home, the Fenians recruited them to the cause in swathes. By 1865, as many as 8,000 of the 26,000 troops wearing a British uniform in Ireland had secretly sworn allegiance to the republican cause.

 

Word of this eventually began to reach the upper echelons of the British Army, which promptly moved many Irish units abroad once more. In September 1865, British authorities then launched a crackdown, rounding up leading civilian Fenians, as well as their counterparts in the military. For the civilian Fenian leaders, the consequences were severe: penal servitude. But for the “military Fenians”, the sentence was much worse: death.

  

After six months of solitary confinement in the horrors of the infamous Dartmoor, Portland, and Millbank prisons, however, the prisoners’ sentences were commuted. For civilians such as John Devoy, it was banishment and exile from Britain and Ireland, while the ex-military Fenians had their death sentences were commuted to lifelong penal servitude in the colony of Western Australia.

 

To Hell or Fremantle

 

And so, on the morning of October 12, 1867, the final group of 20 prisoners were manacled in irons, arm and leg, and were loaded on board the prison ship Hougoumont – the last convict ship ever sent to Australia. Setting sail from Portland Harbor, it carried some 320 criminal convicts and 63 Fenian political prisoners. After a gruelling journey of nearly 18,000 kilometres, they arrived in Fremantle on January 10, 1868.

 

There, they entered a prison system designed not merely to confine, but to erase them from history and the world. Fremantle Prison stood at the edge of what was then the most remote colony in the British Empire. Its security relied not only on walls and warders, but on geography itself. To the east lay vast stretches of unforgiving and uncharted scrub and desert. To the west was the Indian Ocean, shark-infested and seemingly endless. Escape was considered impossible. It was, in effect, a natural prison, “where nature was both the jail and the jailer.”

 

The Fenian prisoners were stripped of their identity and assigned instead a four-digit code numbers, and set to hard labour – building roads, clearing land, and constructing the infrastructure of the colony that confined them. At night, they were locked into cramped cells, their days governed by strict regulations and brutal discipline. Among them were the six men who would later become known as the Catalpa Six: James Wilson, Thomas Darragh, Martin Hogan, Michael Harrington, Thomas Hassett, and Robert Cranston. 

 

A Voice From The Tomb

 

The turning point came with the escape of John Boyle O’Reilly in 1869. Unlike the later rescue mission, O’Reilly’s flight was a solitary gamble. Taking advantage of a relatively relaxed work assignment, he fled into the bush – assisted by an Australian sympathiser – before rowing 40 miles out to sea to intercept an American whaling ship. When it failed to arrive, he spent two days without food or water, adrift in the ocean, before returning to shore and – through his contact – successfully securing passage on another American whaler.

 

While his jailers were suprised at his escape, they should not have been: O’Reilly had already been the only one of the Fenian prisoners to escape England’s Dartmoor prison (although he was recaptured two days later). Upon landing in Fremantle, he promised his comrades once again to be the first to escape from “the Establishment”. O’Reilly’s journey to the United States was long and perilous, but his survival transformed the situation. He soon became editor of The Boston Pilot newspaper and began campaigning and plotting for the rescue of the remaining prisoners, using himself as living proof that escape was possible. 

 

In Irish-American circles, the plight of the “military Fenians” quickly became a cause célèbre. Letters smuggled out from the prison began to circulate, none more powerful than one from James Wilson, addressed to John Devoy, now a New York Herald journalist and a leader of Clan na Gael in New York: “Dear friend, remember this is a voice from the tomb…” The phrase captured the imagination of the Irish diaspora in America. Devoy also took up their cause as a matter of honour: these were men he and others had recruited to the Irish Republican Brotherhood more than a decade earlier.

 

Planning the Impossible

 

Devoy set about masterminding a plan. Across the United States, the Irish diaspora raised funds and a whaling ship, the Catalpa, was purchased in New Bedford, Massachusetts, and refitted for a long voyage. The choice of vessel was deliberate: a whaler could travel vast distances without arousing suspicion, its commercial purpose providing cover for a covert mission. The captain chosen for the enterprise was George S. Anthony, a Protestant American with no direct connection to Ireland. His role would prove decisive.

 

Meanwhile, two veteran Fenian operative, John Breslin from Boston, and Thomas Desmond from San Francisco, travelled to Western Australia on board the small steamer Cyphranes in November using assumed identities – Breslin posing as an American millionaire, Desmond as a wheelwright. Breslin – masquerading as “James Collins” – ingratiated himself with colonial society, meeting with the Governor and even gaining a guided tour of Fremantle Prison. There, he confirmed what he already suspected: a jailbreak from within was impossible. The only chance lay in intercepting the prisoners outside the walls. To make matters worse, delays plagued the Catalpa’s voyage, and Breslin waited months in Fremantle, his funds dwindling and the risk of exposure growing.

 

Vital Local Support

 

The operation’s success also depended heavily on local support for the Irish cause in the colony itself. By the 1870s, many Fenian prisoners who had received early conditional release for good behaviour (so-called “tickets-of-leave”) were living and working within the colony. These men formed a local support network that proved essential to the rescue effort. Breslin made contact with a former inmate who had access to the jail to open lines of communication. Meanwhile, Desmond organised transport for the escape and recruited several local Irishmen to cut the telegraph wires to Perth on the designated day.

 

Even so, the operation was nearly derailed by paranoia and poor communication. Breslin found himself crossing paths with the same two men multiple times, and began to fear the British had uncovered the plan. Eventually the men made contact – they were actually Fenian agents sent from Ireland to arrange a prison break. At the same time, another local Fenian, John King, was himself organising a rescue plan. Breslin brought the others on board, consolidating their plans into his own.

 

Local knowledge was also integral to the timing of the escape. Easter Monday coincided with the annual Perth regatta, drawing officials and resources – not least horses that might be used in any pursuit – away from Fremantle. This apparently minor logistical detail gave the rescue plan an advantage that proved to be decisive.

 

From the Prison to the Sea

 

On Easter Monday, 17 April 1876, the plan was set in motion. The morning of the escape the six prisoners were working outside the prison walls, a privilege granted because of the colony’s isolation They slipped away in small groups, with Breslin and Desmond collecting them in horse-drawn carriages, and together they began a desperate 20-mile dash south towards Rockingham Beach. The ride was frantic. The horses, pushed to their limits, collapsed from exhaustion as they reached the coast. There, a whaleboat from the Catalpa awaited.

 

Their ordeal was far from over, however. The Catalpa lay miles offshore, beyond territorial waters. The fugitives and their rescuers rowed out into the open ocean. Behind them, British authorities soon commandeered the steamer Georgette in pursuit, and the race was on. As night fell, a storm struck, snapping the mast of the escapees’ overloaded small boat and forcing them to improvise. They hoisted a jury sail on an oar and rowed and bailed through the night on the rough seas, battling exhaustion, exposure, and fear.

 

Showdown on the High Seas

 

At dawn on April 18, they caught sight of the Catalpa, with the Georgette bearing down on it in international waters. The steamer had passed within perhaps half a mile of them overnight, but had disregarded the mastless boat as flotsam. As their boat neared the Catalpa, the ship moved towards it, arousing suspicions on board the Georgette, but Samuel Smith, the first mate, manoeuvred the ship so it lay between the whale boat and the steamer, allowing the fugitive group to board. Once on board, the escapees began to loudly mock their former jailers on board the Georgette, and the steamer, low on fuel, was then forced to return to shore. But then the wind dropped, and the Catalpa was becalmed – albeit in international waters.

 

At dawn the next day, the Georgette, this time fully loaded with police and with a small canon on board. A dramatic maritime confrontation ensued. The Georgette moved to intercept, firing a warning shot across the Catalpa’s bow. Just at this moment, a light breeze began to stir, filling the ship’s sails. As the Georgette pulled up alongside the Catalpa, British Army Colonel Harvest demanded the return of the escaped prisoners. Captain George S. Anthony refused, responding: “You’re mistaken. There are no prisoners aboard this ship. They’re all free men.”

 

The standoff continued as the Georgette attempted to force the Catalpa back into territorial waters, and the wind continued to rise. Concerned at the changing conditions, Harvest gave Anthony an ultimatum: ‘I’ll give you fifteen minutes in which to heave to, and I’ll blow your masts out unless you do so.” Hoisting the American flag, Captain Anthony then called the ultimate bluff. “This ship is sailing under the American flag, and she is on the high seas. If you fire on me, I warn you that you are firing on the American flag.” Fearful of provoking a diplomatic incident, the Georgette broke off pursuit, and the Catalpa pulled away in the wind. The six Fenians were free, and the Catalpa sailed on to the United States and into the history books.

 

Across the World to Freedom

 

When the Catalpa arrived in New York in August 1876, it was met with a “tumultuous” welcome. Thousands gathered to greet the rescued heroes, while journalists swarmed on board the ship. Yet freedom had come at a cost: none of the six would return to Ireland. Like many Fenians, they lived out their lives in exile, building new identities in American cities. Their stories became part of the broader narrative of Irish diaspora – one of displacement, resilience, and support for the Irish struggle from afar.

 

In Australia, too, the memory of the daring escape has endured. The site of their departure at Rockingham is today marked by the Catalpa Rescue Memorial, featuring bronze sculptures of wild geese taking flight – a symbol of Irish exile, recalling the generations of soldiers and rebels who left Ireland’s shores to fight abroad. A ballad – parodying the better known “Botany Bay” – of the events was soon composed, and – despite attempts to suppress it, was frequently heard in Perth and Frematle well inot the early 1900s. A version of the chorus was even published in the Bunbury Herald in March 1909:

 

“Come all you screws, warders and gaolers,
Remember Perth Regatta Day;
Take cars of the rest of your Fenians,
Or the Yankees will take them away."

 

A Global Propaganda Victory

 

The true significance of the Catalpa Rescue lay not only in its immediate success, but in its lasting impact. For the Fenian movement, it was a transformative political victory. At a time when the movement had suffered setbacks and divisions, the operation demonstrated a capacity to act, sustained by a powerful transatlantic network. It showed that Irish nationalism had evolved into a global movement, capable of challenging and embarrassing the British Empire on the world stage.

 

John Devoy and Clan na Gael emerged strengthened. The rescue validated their strategy of combining political agitation with dramatic action. It also energised Irish-American support, reinforcing the idea that the diaspora had a crucial role to play in the struggle for independence, and sustaining the momentum of militant nationalism in exile. The networks, funding channels, and organisational structures that enabled the rescue would later contribute to the revival of the Fenian Brotherhood and the planning of the 1916 Easter Rising.

 

John Devoy

One Easter Morn…

 

Indeed, there is a direct line – ideological, organisational, and financial – from this Fenian activism of the 1870s to the revolutionary generation of 1916, and beyond. Figures like Devoy remained central to that continuity, supporting and shaping the movement from abroad. Devoy himself dedicated more than sixty years to the struggle for Irish freedom, and was one of very few people to have played a role in the Fenian Rising of 1867, the Easter Rising of 1916, and the Irish War of Independence of 1919–21.

 

The symbolic resonance of Easter is striking. The Catalpa escape took place on Easter Monday in 1876. Exactly, forty years later, on Easter Monday 1916, the Easter Rising would begin in Dublin, drawing on not only the same traditions of sacrifice and defiance, but on the material and moral support of the Fenian movement in the United States.

Shameful Silence

 

Even so, for all its drama and significance, the Catalpa Rescue appears to occupy an uneasy place in official Irish memory. The National Museum of Ireland does not tell its story, and the American flag raised on the Catalpa – donated to the museum in 1972 by 1916 Rising veteran and vice-president of Sinn Féin, Joe Clarke – has been hidden away for years. Even now in 2026, the 150th anniversary of the escape, it has taken public pressure for the Museum to put the flag on display for a paltry two days in the Collins Barracks this weekend.

 

No other artefacts related to the Catalpa escape held by the museum are to be displayed, and no plans are being made to do so. These include original letters from the prisoners and items from the correspondence of John Devoy. Calls from Sinn Féin Seanadóir Conor Murphy for an Irish state commemoration of the event have also been ignored, despite multiple events being held in both Fremantle and Boston. The silence from official Ireland on commemorating such an important event is deafening.

 

On a Distant Shore

 

Nonetheless, the Catalpa Rescue also endures because it speaks to something fundamental in Irish history: the power of exile to shape the struggle at home. From the cells of Fremantle to the streets of New York, from the whaling ports of Massachusetts to the distant shores of Western Australia, it is a story that unfolded across the Irish world. It was made possible by networks of international solidarity that transcended geography, and by individuals who believed that distance did not diminish obligation to fight injustice.

 

When James Wilson wrote of his “voice from the tomb,” he could not have known that it would set in motion one of the most remarkable rescue operations in history, setting in motion events spanning oceans and resonating – down through the years – into the events of 1916 and all that has followed. At Rockingham today, the bronze wild geese face out to sea, frozen in the moment of departure. They recall not only the six men who escaped, but the countless others who left Ireland’s shores in search of freedom – or were forced from them – yet refused to abandon the cause.

 

In that moment, on a distant shore in 1876, a tide turned in the struggle for Ireland. The voice of Irish republicanism, buried alive by the British Empire in a living prison on a distant shore, called out. The Catalpa sailed across an ocean to answer that call, and when it returned, it carried the seeds of hope and freedom. One hundred and fifty years on, those seeds, sown by the young men of '65 and '67 – and '76 – continue to blossom and grow.

“Death or Liberty” – Australia’s Battle of Vinegar Hill at 220

220 years ago, on March 5, 1804, several hundred armed rebels – mostly escaped Irish political prisoners, veterans of Vinegar Hill and the United Irishmen rebellion of 1798 – clashed with British armed forces near Castle Hill in western Sydney. They lost, but while their rebellion was short-lived, it was far from the impromptu uprising many suggest. Rather, it was just the latest, and largest, manifestation of an ongoing Irish republican struggle in the fledgling colony.

In terms of scale, the ‘battle’ of Castle Hill was truthfully little more than a skirmish in the bush in western Sydney. Only a handful of rebels were killed, the rest fled, and their leaders were easily captured by crown forces under a false flag of truce. The rebel forces were poorly organised and divided, while – due to betrayal – hundreds more who would otherwise have joined them did not. Even so, the rebellion shook the colony to its core – a reaction that can only be understood in the context of the years immediately preceding it, both in Sydney, and in Ireland.

A vulnerable penal colony

By 1800, Sydney Town was a young settlement of barely 12 years, with only 2500 European inhabitants – 43 percent of them convicts. Further inland, Toongabbie and Parramatta had a combined population of under 1500, and perhaps another 1100 – mostly free settlers – could be found in the Hawkesbury. The colony was dotted with several small garrisons, but the military presence was confined largely to Sydney Town.

The economic viability of the settlement was also still uncertain, particularly after huge floods in 1799. This instability was to continue for several years, with ships sent to seek emergency food supplies from India as late as 1813. While hindsight can give rise to a misleading sense of inevitability, this vulnerability would have been palpable at the time, not least to hundreds of Irish political prisoners – convinced republicans and veterans of a large-scale armed rebellion against the British only months before.

The first ships carrying around 400 of these Irish political prisoners arrived at the start of 1800, sent as exiles-without-trial to the New South Wales colony in the aftermath of the failed United Irishmen rebellion of 1798. While some were senior members of the United Irishmen, arrested before the rebellion had begun, others had seen action in Waterford, Wexford, the Midlands, and the north. It would soon become apparent that the long journey to Australia had failed to break their spirits.

Sedition and conspiracy

As early as February 1800, records tell of a seditious meeting among the Irish being broken up in Sydney, while another plot was reported in May. In September, another conspiracy among the Irish prisoners was uncovered, with plans to take the Sydney barracks and overthrow the Governor, and for the rebels to then live on the settlers’ farms until they heard back from a message they would send to France. More disturbances were reported in October, with suspected ringleaders shipped off to Norfolk Island to defuse their plotting – unsuccessfully. In December, a rebellion on Norfolk Island was apparently averted only by the pre-emptive execution of two of its leaders.

Such accounts make the colony seem a hotbed of rebel activity, but it is difficult to know how much was true, and how much was British paranoia. One witness testified to the notorious “Flogging Reverend”, Samuel Marsden, in 1800 that she became convinced the Irish were planning “something that was improper” after seeing them “talking very earnestly in Irish”. A sectarian bigot, Marsden was already predisposed to distrust the Irish, describing them as "the most wild, ignorant and savage race that were ever favoured with the light of civilisation", while considering Irish convicts even worse, “depraved beyond all conception”.

Bigotry and sectarianism

Yet while the evidence of conspiracy and unrest may have been often flimsy, the British fear and distrust of the Irish was real enough, reflecting both ingrained ethnic prejudices and genuine political insecurities in aftermath of the events of 1798. Governor John Hunter – replaced by Governor Philip Gidley King in late 1800 – repeatedly complained to London that the Irish prisoners were “turbulent” and “diabolical” and called for the number of Irish transportees to be drastically reduced in the interest of colonial security.

Another consequence of the 1800 Irish scare was the establishment, on September 7, of an official civilian paramilitary movement: the Loyal Associations of Sydney and Parramatta, each with a captain, three sergeants, two drummers and three corporals, 36 privates in the Sydney group, and 29 in Parramatta. These loyalist paramilitaries were suspended by Governor King in August 1801, but recalled on December 9, 1803, when news arrived that France and England were at war. They marked the beginning of a conservative, protestant, “law and order” tradition that was to continue well into the twentieth century, built on profound distrust of, and discrimination against, the Irish Catholic community in Australia.

Echoes of Emmet’s rebellion

Further ships soon arrived from Ireland – the Anne, which reached Sydney in 1801 after surviving a mutiny by the prisoners onboard, and the Atlas I, Atlas II, and Hercules in 1802. Each carried more veterans of 1798, along with the latest updates of the state of unrest in the Irish countryside. Perhaps in response to news that the rebellion had finally been defeated, reported Irish agitation in the colony lessened, so much so that the British allowed the colony’s first Catholic priest to (briefly) perform his ministry. As late as March 1, 1804, Governor King wrote to London that the Irish in Sydney were now behaving themselves.

The spark for a new rebellion was already being kindled, however, after the whaling ship the Ferret arrived in Sydney in January 1804, bringing newspapers dating from August 1803. These bore tidings of Robert Emmet’s new United Irish rising near Dublin – but not of its demise, which followed closely in the weeks that followed. Not to be dampened by news of later events, word of Emmet’s uprising spread through the colony like wildfire, and six weeks later – whether by coincidence or not, on Emmet’s birthday – that spark became a flame.

“Liberty or Death…”

Literally, as it turns out. Instructions spread on March 4 that the rebellion would begin at nightfall, and the official signal was when one of the leaders, John Cavenah, set fire to his hut at Castle Hill Government Farm at 8 o’clock. That night, some 200-300, mostly Irish, prisoners escaped from the prison farm, led by Philip Cunningham – a key architect of the rebellion. A Kerry-man, Cunningham was a veteran of the 1798 United Irishmen rebellion and of its aftermath, where he had been captured and tried in Clonmel while rebuilding the United Irishmen in Tipperary. He had also been involved in the mutiny on board the Anne during its journey to Australia.

The signal fire was not seen by his comrades at Green Hills (today's Windsor) on the Hawkesbury River, but Cunningham proceeded with his plan regardless, taking weapons, ammunition, and food from the Castle Hill Government Farm, and recruiting local supporters. The rebels - their numbers soon swelling to over 685 - adopted the slogan “Death or Liberty” as their rallying call, planning to join hundreds more from the Hawkesbury area, to rally at Constitution Hill, and to march on Parramatta and then Sydney’s Port Jackson itself. There they would establish Irish rule and send those who wished it back to Ireland to reignite the 1803 rebellion.

Damned Betrayal

After looting the government farm, the rebel group divided into smaller parties, going from farm to farm on their way towards Constitution Hill, collecting further supplies and recruits. Their actions were informed by intelligence gathered the previous year, when 12 escaped prisoners sought out friends and sympathisers in the surrounding districts. Even so, many lost their way during the night and failed to reach the rendezvous point – including a group of 70 under the command of Samuel Humes. These losses were worsened when plans to join with hundreds of prisoners in the Hawkesbury region went awry after John Griffen, the courier taking their mobilisation orders, betrayed the uprising and surrendered to authorities that night.

Another small group of rebels attempted to enter Parramatta to set a building alight as a signal for local rebels and those in Sydney to join the rebellion, but two defectors again ruined the plan. Captain Edward Abbott commenced defensive measures in Parramatta and sent a message to Governor King in Sydney. King, alerted to the rebellion late during the evening of March 4, declared martial law, although when news of the uprising reached the small colony, a great panic set in, with some officials – including Samuel Marsden – fleeing the area by boat. Major George Johnston of the New South Wales Corps (himself later to play a key role in the Rum Rebellion coup d’état of 1808) quickly gathered a force of British troops and a large civilian militia – including the Sydney Loyal Association – to pursue the rebels.

New Ireland

With the element of surprise lost and plans to mobilise rebels in the Hawkesbury, Parramatta and Sydney having failed, the uprising was confined to the area west of Parramatta. Cunningham, lacking any sign that Parramatta had been taken, and without the expected reinforcements, was forced to withdraw the rebel group to Toongabbie to re-assess strategy, gather new forces, and perhaps find his lost comrades. In the process, he also collected a significant number of arms, by this point possessing of perhaps a third of the colony’s entire armaments, but the rebel forces continued to dwindle in number. Those that remained are reported to have proclaimed the area around Constitution Hill "New Ireland”.

Meanwhile, Major Johnston’s much smaller crown forces endured a forced march through the night, coming to within only a few kilometres of the remaining rebels, now reduced to approximately 233, on the morning of March 5. Outnumbered and tired, Johnston decided to employ delaying tactics, riding on ahead of his men along with a trooper, Thomas Anlezark, and the colony’s sole Catholic priest, Father Dixon – himself an Irishman exiled to Australia following 1798 – to demand the rebels surrender, and to otherwise parley with them while his troops advanced to a more favourable position.

“… and a ship to take us home!”

Sending first the trooper Anlezark, and then Father Dixon, to demand (unsuccessfully) that the rebels down arms and accept an amnesty, Major Johnston himself finally rode up to meet them. Cunningham’s response, however, remained emphatic: “Death or liberty”. It is sometimes claimed that he also said, “and a ship to take us home”, although that addition is first recorded some while later. During this exchange, the government troops and the loyalist militia finally appeared, lining up behind Major Johnston. Seizing his opportunity, Johnston – still under a flag of truce – took Cunningham and another rebel leader captive at gunpoint.

Quickly retreating with the captured Cunningham, Johnston ordered crown forces to fire on the rebels. After fifteen minutes of gunfire, followed by a charge, between 15 and 20 rebels were killed, the others scattering into the bush in disarray. An unknown number – certainly more than a dozen – were killed in the pursuits that followed into the night and the following days. Governor King then announced leniency for those who surrendered before March 10, leading many of those who got lost on the night of March 4 to give themselves up, while the large group commanded by Samuel Humes was captured by the Parramatta Loyal Association militia at Castle Hill.

Aftermath

The extent of British alarm over the Castle Hill rebellion can be measured by the scale of repression that followed. While some have estimated that 39 rebels died in, or as a result of, the Castle Hill uprising, the precise numbers will never be known. Around 230 people were arrested in the days following the rebellion, of whom nine were executed. Eight of these received a court-martial, while a wounded Cunningham was hanged without trial on the steps of the Government Store at Windsor, which he had claimed he would burn down. Interestingly, of those executed, four were Protestant, and two were English.

Two prisoners – including Humes – were hung from the gibbet, while two others, Bryan McCormack and John Burke, were reprieved and detained. Seven were whipped with between 200 or 500 lashes and sent to the Coal River chain gang at Newcastle, and a further 23 others were sent to the Newcastle coal mines. Another 34 prisoners were placed in irons until they could be "disposed of”, but their fate remains unclear. Of the approximately 150 rebels that remained, many were sent to Norfolk Island on good behaviour bonds, but the majority were pardoned and allowed to return to their previous lives, it being adjudged that they had been coerced into rebellion.

The International Society of United Irishmen?

Martial law ended on 10 March 1804, but the Irish insurgency in Sydney – both real and imagined – continued. Two Frenchmen who had come to the colony to cultivate vines were expelled on suspicion. More realistic plots continued to develop, with authorities on the constant alert over the following three years. For his part, Governor King was convinced that the true leaders of the 1804 rebellion had remained out of sight, and were continuing to plot the colony’s demise. As a result, he sent numerous suspects to Norfolk Island as a preventative measure.

Whether King was correct will likely never be known – the identity of the rebellion's co-conspirators in Parramatta, Sydney and the Hawkesbury are lost to history. It is true, however, that the rising was neither as spontaneous nor isolated as most Australian historiography would have us believe. Indeed, there are unverified claims that at least two Irish prisoners who arrived in February 1800 on board the Friendship were corresponding with the United Irish leadership around Emmet to establish a secret branch of an “International Society of United Irishmen” in Sydney to act there under direction from Ireland.

Loyalist paranoia about Irish republicanism was further fed by the arrival in February 1806 of another group of Irish political rebels on board the Tellicherry. They included the last hard core of United Irishmen, and were led by none other than Michael Dwyer, the “Wicklow Chief”, who had only surrendered in December 1803 on condition of voluntary exile to the United States of America. Perfidious Albion, of course, had other ideas, sending Dwyer, Hugh Byrne, Martin Burke, Arthur Devlin, John Mernagh, and a dozen of their comrades to Botany Bay. Perhaps regrettably, the loyalist fears of renewed rebellion were misplaced.

Australia's Vinegar Hills

Known as Australia’s “Battle of Vinegar Hill” due to its links with the Irish events of 1798, and that famous battle in particular, the 1804 Castle Hill rebellion is now commemorated at the Vinegar Hill Memorial, Castlebrook Memorial Gardens, in Rouse Hill. A monument was unveiled by former Prime Minister Gough Whitlam in 1988, carrying the names of several contemporary politicians and councillors, but with none of the rebels. This rather blinkered oversight was remedied on the bicentenary of the rebellion in 2004 with a new plaque.

The Castle Hill rebellion was also the opening sally in a longer struggle for democracy in Australia in which Irish republicans have played a key part. The anti-authoritarian streak, and the lived experience of many Irish in Australia, found its expression in the widespread popular support for the Kelly Gang in northeast Victoria, in the better expressions of Australia's trade union movement, in the struggle against conscription during World War One, and in the fight for Aboriginal rights. In 1920, 100,000 people marched in Melbourne's annual Saint Patrick's Day Parade to demonstrate their support for Irish independence.

Perhaps the most iconic such expression, however, took place fifty years after Castle Hill at the Eureka Stockade rebellion on the Ballarat goldfields in Victoria. It, too, was defeated in blood, but the popular support it enjoyed saw one of its key demands realised: a Legislative Assembly in the Victorian colony. The Eureka rebels – migrants from every corner of the earth – were inspired by the same ideals of liberty, justice, and freedom as the heroes of '98 and '04. Led by Peter Lawlor, the brother of Young Irelander James Fintan Lawlor, they raised a standard of liberty while using the password "Vinegar Hill".