On 22 August 1798, a French expedition of about 1,000 soldiers landed at Kilcummin, a small coastal settlement near Killala in County Mayo. Led by General Jean-Joseph Amable Humbert, the force came to support the United Irish rebellion against British rule.
The landing arrived late. The principal risings in Leinster and Ulster had already been defeated. Yet for a few extraordinary weeks, the arrival on Ireland's western coast revived the rebellion, drew local recruits and carried the conflict from Killala to Castlebar and beyond.
Why France sent troops to Ireland in 1798
The Society of United Irishmen had developed from a reform movement into a revolutionary organisation seeking an Irish republic. Its leaders hoped to unite Catholics, Protestants and Dissenters around political equality and independence, and they sought military assistance from revolutionary France.
A much larger French fleet had tried to reach Bantry Bay in December 1796, but severe weather and confused command prevented a landing. In 1798 the United Irish rising began without the decisive French support its planners had expected.
By August, government forces had crushed the main centres of rebellion in counties Wexford, Antrim and Down. Executions, reprisals and sectarian violence had scarred communities. Humbert's force therefore landed in a country where rebellion was still alive as an idea but had been badly broken as an organised national campaign.
What happened at Kilcummin on 22 August?
Humbert's ships reached the north Mayo coast and anchored off Kilcummin on 22 August. The Dictionary of Irish Biography records that the expedition numbered about 1,000 men. Troops came ashore with arms and equipment, then moved toward the nearby episcopal town of Killala.
Killala was taken quickly. Its Church of Ireland bishop, Joseph Stock, later left an important account of the occupation. The French established their first base there and issued a proclamation calling on Irish people to join them. A surviving copy in the National Museum of Ireland is direct evidence of how the expedition presented its purpose.
Local people did join, although surviving sources differ on numbers and on the mixture of motives involved. Some were committed United Irishmen; others may have been drawn by local grievances, opportunity or the sudden appearance of an army that seemed capable of challenging government power. It is safer to acknowledge that range than to give every participant the same motive.
Who was General Humbert?
Jean-Joseph Amable Humbert was an experienced officer of revolutionary France. He had served in western France and on the unsuccessful Bantry expedition. In Mayo he showed speed and tactical confidence, but his small force operated far from reinforcement and depended on turning a landing into a much larger Irish mobilisation.
From Killala to the “Races of Castlebar”
After securing Killala, the Franco-Irish force moved inland. At Ballina and along the route, more recruits joined. On 27 August Humbert defeated a larger government force at Castlebar.
The rapid government retreat became popularly known as the “Races of Castlebar.” The phrase captures the surprise of the defeat, but it can obscure the serious fighting and casualties. Humbert's men had used difficult ground and an unexpected approach to unsettle their opponents.
The victory gave the expedition momentum and created a brief political experiment. John Moore of Moore Hall was named president of what later became known as the Republic of Connacht. The title suggests a coherent state, but in practice the administration was improvised, local and short-lived.
Why the campaign could not last
Humbert needed a wider rising and further French help. Neither arrived in sufficient strength. As the expedition moved east, government forces closed in. On 8 September, at Ballinamuck in County Longford, Humbert surrendered to the army commanded by Lord Cornwallis.
The French soldiers were treated as prisoners of war. Irish participants faced a far harsher fate; many were killed during and after the defeat, while others were executed or punished. The unequal treatment reflected the legal distinction the government made between foreign soldiers and subjects considered rebels.
Killala itself remained exposed after Humbert marched away. Government forces retook the town later in September, and violence accompanied the end of the local rising. The campaign's military life was brief, but the cost to communities was not.
How the French landing has been remembered
In Mayo, the landing is remembered as one of the most dramatic episodes of 1798: ships on an Atlantic horizon, foreign troops on a remote shore, an unexpected victory at Castlebar and a republic proclaimed for only a matter of days.
Memory can make the episode look inevitable or romantic. It was neither. The expedition was small, its timing was desperately late, and local participation was complicated. Its significance lies in what it revealed—the rebellion's continuing reach, the depth of hopes invested in French assistance and the gulf between revolutionary ambition and military reality.
The Killala story also belongs within the wider, regionally varied history of 1798. The Irish families associated with the 1798 Rebellion carried different experiences, while the Battle of Vinegar Hill shows how the rising unfolded earlier and far to the southeast. For a local family-history path, explore Irish surnames rooted in County Mayo.
Why 22 August still matters
The landing at Kilcummin on 22 August 1798 gave the rebellion an unforeseen western chapter. It connected a remote Mayo shoreline to the age of Atlantic revolutions and transformed local places—Killala, Ballina and Castlebar—into stages of an international conflict.
For descendants, the episode is also a reminder that family history often sits beside national history without appearing neatly in official narratives. If your own roots lead to Mayo or elsewhere in Ireland, you can search for your Irish surname and follow the names, counties and communities behind the larger story.
Frequently asked questions
Where did the French land in Ireland in 1798?
General Humbert's expedition landed at Kilcummin, near Killala on the north coast of County Mayo, on 22 August 1798.
How many French soldiers landed?
Contemporary and later accounts vary slightly, but the expedition is commonly described as numbering about 1,000 French troops.
What happened after the landing?
The force captured Killala, won a striking victory at Castlebar on 27 August and then moved east. Humbert surrendered at Ballinamuck on 8 September 1798.