The 1798 Rebellion: How the United Irishmen Rose Against British Rule

The United Irishmen's 1798 rising united Catholics and Protestants against British rule, but ended in defeat, atrocity, and the Act of Union.

25 July 2026 · Part of Irish Rebellions & the Road to Independence →

In the early hours of 24 May 1798, mail coaches failed to arrive at their scheduled stops across Leinster — the prearranged signal for a rebellion years in the planning to begin. Within days, tens of thousands of Irish men, armed mostly with pikes and pitchforks, had risen against the British Crown in the largest and bloodiest rebellion in Irish history. The rising was the work of the Society of United Irishmen, a movement that had set out seven years earlier with a strikingly modern ambition: to unite Catholic, Protestant, and Presbyterian Irishmen in a single political nation, "the common name of Irishman," and break the country free of British control. By late summer it was over, crushed county by county, its leaders dead, exiled, or awaiting the gallows. Yet its consequences reshaped Ireland's constitutional relationship with Britain for more than a century.

From Debating Society to Underground Republic

The United Irishmen began in Belfast in October 1791, founded chiefly by Theobald Wolfe Tone, a Dublin-born Protestant barrister, together with Presbyterian merchants and professionals frustrated by their exclusion from full political power under the Anglican-dominated "Protestant Ascendancy." Inspired by the American and French Revolutions, the society campaigned openly at first for parliamentary reform and Catholic emancipation, arguing that Ireland's sectarian divisions were a tool used by the ruling elite to keep the country's Catholic majority and Presbyterian dissenters permanently apart and powerless. This was a radical proposition in a kingdom still governed under the penal framework of the Protestant constitutional settlement that had followed the seventeenth century's wars of religion.

The government's tolerance did not last. As war broke out between Britain and revolutionary France in 1793, the authorities grew alarmed at a movement openly sympathetic to French republicanism, and outlawed the Society in 1794. Rather than dissolving, the United Irishmen reorganized underground as an oath-bound revolutionary body, its structure of cells and county "directories" modeled loosely on French Jacobin clubs. Its goals hardened from reform to full separation: an independent Irish republic, achieved if necessary with French military help. Wolfe Tone traveled to Paris to lobby the French Directory directly, and in December 1796 a French invasion fleet of roughly 14,000 troops under General Lazare Hoche did reach Bantry Bay in County Cork — only to be scattered by violent winter storms before a single soldier landed. The near-miss convinced Dublin Castle that the United Irish threat was real and imminent.

The Government Strikes First

Through 1797 and early 1798, the authorities pursued a deliberate policy of pre-emptive terror, particularly in Ulster, where martial law, free quartering of troops on suspect households, and punishments including flogging and "pitch-capping" (forcing burning pitch onto a victim's scalp) were used to extract confessions and disarm the countryside before a rising could begin. The campaign, later remembered as the "Dragooning of Ulster," succeeded in crippling the movement's best-organized province. In March 1798, government informers — the United Irishmen were riddled with paid spies almost from their founding — enabled the mass arrest of the Leinster Directory at a house in Dublin, decapitating the rebellion's central leadership weeks before it was due to begin. Lord Edward Fitzgerald, the aristocratic radical who had emerged as the rising's military commander, evaded capture until 19 May, when he was fatally wounded resisting arrest; he died in Newgate Prison on 4 June, before the worst of the fighting was even over.

Stripped of coordinated leadership and betrayed from within, local United Irish commanders in Leinster decided they had no choice but to rise anyway, rather than wait to be arrested one by one.

Wexford's Republic

The rebellion that broke out on 23–24 May was fiercest and most successful, however briefly, in County Wexford, a county with little prior reputation for United Irish organizing. Provoked by brutal army searches for arms, Wexford's rebels — led in the field by the parish priest Father John Murphy, a former loyalist radicalized by the burning of his own chapel — won a startling victory at the Battle of Oulart Hill on 27 May, destroying a detachment of the North Cork Militia. Enniscorthy and the county town of Wexford fell within days, and the rebels briefly governed the county through an elected committee, sometimes called the "Wexford Republic," that tried, with mixed success, to prevent reprisals against Protestant loyalists and property.

That restraint did not hold everywhere. On 5 June, a rebel assault on the garrison town of New Ross was repulsed with heavy losses after fierce street fighting. The same day, at Scullabogue, a barn holding loyalist prisoners — men, women, and children, Protestant and Catholic alike — was set alight, killing more than 100 people in one of the rebellion's darkest atrocities, a stark contrast to the United Irishmen's founding ideal of non-sectarian brotherhood. The rising's momentum broke at the Battle of Vinegar Hill on 21 June, when General Gerard Lake led a large government force in overrunning the rebel camp outside Enniscorthy. Vinegar Hill effectively ended the Wexford rebellion as an organized force, though guerrilla resistance under leaders such as Michael Dwyer continued in the Wicklow Mountains for years afterward.

Ulster's Presbyterian Rising

Despite the earlier crackdown, County Antrim and County Down also rose in early June, led by Presbyterian radicals rather than the Catholic tenant farmers who dominated the Wexford rising — a reminder that the United Irishmen's cross-sectarian founding vision was not mere rhetoric. Linen merchant Henry Joy McCracken led an attack on the town of Antrim on 7 June that was ultimately repelled; Henry Munro's rebels seized Ballynahinch in County Down but were defeated there on 9 June. Both risings collapsed within days. McCracken was captured and hanged in Belfast on 17 July, reportedly refusing an offer of clemency in exchange for informing on his comrades.

Too Little, Too Late: The French Landing

French help finally arrived on 22 August 1798, more than two months after the main Irish risings had already been crushed. General Jean Humbert landed at Killala Bay in County Mayo with roughly 1,000 French troops and enough arms to equip thousands of local recruits. His small force won a startling early victory at the Battle of Castlebar on 27 August — remembered derisively by the British as the "Races of Castlebar" for the speed of the government militia's retreat — and briefly presided over a "Republic of Connacht." But without further French reinforcement and facing an overwhelming government army under Lord Cornwallis, Humbert's combined force was defeated at the Battle of Ballinamuck on 8 September. Wolfe Tone himself was captured at sea in October, aboard a small French squadron intercepted off Lough Swilly. Court-martialed in Dublin and sentenced to hang, Tone died on 19 November 1798 from a self-inflicted throat wound, reportedly to deny the government the satisfaction of a public execution.

Chronology of the 1798 Rebellion

Aftermath: The Act of Union

Estimates of the rebellion's death toll vary, but most historians place the figure between 10,000 and 30,000 killed in less than four months of fighting, the overwhelming majority of them rebels and civilians rather than government soldiers. For Prime Minister William Pitt the Younger, the rising — and the demonstrated willingness of France to use Ireland as a back door into Britain — proved that a separate Irish Parliament in Dublin was a standing security risk. Pitt pushed through the Act of Union, which came into force on 1 January 1801, abolishing the Irish Parliament and folding Ireland directly into a new United Kingdom of Great Britain and Ireland governed from Westminster. The promised companion measure, Catholic emancipation, was blocked by King George III and delayed for another generation, a broken promise that fed directly into the next century of Irish nationalist grievance and further rebellions, from the complicated, centuries-long Anglo-Irish relationship that followed to the revolutionary wars reshaping the wider continent in the Napoleonic era into which 1798 fed.

Conclusion

The 1798 Rebellion failed in every immediate military sense: no French army arrived in time, no Irish republic was declared and sustained, and its leadership was killed, exiled, or driven underground within months. Yet its ambition — a non-sectarian Irish nation uniting Catholic, Protestant, and Presbyterian citizens against British rule — outlived the defeat and became a founding reference point for Irish republicanism for the next two centuries, invoked by movements from the Young Irelanders of 1848 to the leaders of the 1916 Easter Rising. Its failure also produced the opposite of what the United Irishmen intended: not Irish self-government, but the Act of Union that erased what independence Ireland's Parliament still had.

Frequently asked questions

What caused the 1798 Irish Rebellion? The rebellion grew out of the United Irishmen's frustration with Ireland's exclusion of Catholics and Presbyterian dissenters from full political power, radicalized by the French Revolution and by brutal government repression — including mass arrests, floggings, and "pitch-capping" — carried out in the months before the rising to pre-emptively crush the movement.

Who were the United Irishmen? Founded in Belfast in 1791 by Theobald Wolfe Tone and Presbyterian reformers, the Society of United Irishmen was a movement that sought to unite Catholics, Anglicans, and Presbyterian dissenters as "the common name of Irishman" against British rule, evolving from a legal reform society into an underground revolutionary republican organization after being outlawed in 1794.

Did the French help the Irish rebels in 1798? France attempted to intervene twice. A large invasion fleet was scattered by storms at Bantry Bay in December 1796 before landing, and a much smaller force of roughly 1,000 troops under General Humbert landed at Killala Bay in August 1798, winning an early victory at Castlebar before being defeated at Ballinamuck — arriving too late to support the main risings already crushed in June.

What happened to Wolfe Tone after the rebellion? Wolfe Tone was captured at sea off Lough Swilly in October 1798 while trying to reach Ireland with a French naval squadron. Convicted by court-martial in Dublin and sentenced to be hanged, he died in custody on 19 November 1798 from a self-inflicted wound to the throat, days before his scheduled execution.

Image: "Defeat at Vinegar Hill," an 1845 engraving by George Cruikshank depicting the decisive battle of 21 June 1798 outside Enniscorthy. Public domain, via Wikimedia Commons.

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