The Irish Legion, a light infantry regiment in service of the French Imperial Army for an anticipated invasion of Ireland, is established on August 31, 1803, in Morlaix, France. Bernard MacSheehy, an Adjutant-General in Napoleon‘s army, is assigned to form the regiment. Later expanded to four battalions and a depot, the legion wins distinction in the Walcheren Expedition, the Peninsular War, and the German Campaign of 1813. Following the disbandment of the foreign regiments in 1815, the regiment’s personnel are distributed.

The first officers include members of the Society of United Irishmen who had fled to France in 1797. It also includes Irishmen who had been taken during the Irish Rebellion of 1798 who were freed during the short peace effected by the Treaty of Amiens on condition of exile, and who had sailed for France in June 1802. The treaty breaks down in May 1803 with the start of the War of the Third Coalition. As a part of Napoleon’s planned invasion of the United Kingdom in 1803–05, the Irish Legion is to provide the indigenous core for a much larger invasion force of 20,000 earmarked to take Ireland, known as the Corps d’Irlande.

The purpose of the Legion is to align the Irish hearts to the French cause in the imminent invasion of Ireland. General Charles-Pierre Augereau is ordained to lead the invasion and wants Irishmen to serve in his army. However, the Battle of Cape Finisterre and the Battle of Trafalgar in 1805 make a safe sea crossing uncertain at best, and Napoleon is forced to abandon his plans for Ireland. He shifts his focus towards Austria and Eastern Europe and launches the Austerlitz campaign in late 1805. The legion remains on the French coast on garrison duty and coastal defence.

The Legion is eventually expanded from a battalion to a regiment and there is greater demand for more soldiers. These make a varied group; some are former United Irishmen who were taken prisoner in 1798-99 and then freed during the peace that followed the Treaty of Amiens (1802–03), some had been impressed into the Royal Navy and deserted, and some were German or Polish. While the Legion is stationed at the Fortress of Mainz in 1806, they are joined by 1,500 Poles and many Irishmen who were sent in 1799 to serve the King of Prussia. Its headquarters is at ‘s-Hertogenbosch, known to the French as Bois-le-Duc, in what is then the Kingdom of Holland.

The Irish Legion has its own flag, and in December 1805 receives an eagle. The Legion is the only group of foreign soldiers in the French military to whom Napoleon ever gives an eagle. Wearing a green uniform, its maximum size is about 2,000 men.

The regiment is greatly assisted from 1807 by Napoleon’s war minister Marshal of France Henri Clarke, who was born in France to Irish parents and whose family had close links to the ancien regime Irish brigade that had served the kings of France. He and his father had served in Dillon’s Regiment, and his mother’s father and several uncles served in Clare’s Regiment. In August 1811, the Legion is renamed the 3e Regiment Etranger (Irlandais) (3rd Foreign Regiment (Irish)), but throughout the unit’s history it is always referred to as the Irish Regiment.

The regiment divides in loyalty during the “Hundred Days,” and is officially disbanded by King Louis XVIII on September 28, 1815. Its flags are burned and its eagle, like many, disappears.

(Pictured: Regimental Colours of the Irish Legion (Obverse))