The Regiment de Watteville was a Swiss regiment founded by Louis de Watteville and recruited from regiments that served between 1799 and 1801 in the Austrian army but in British pay. The Swiss soldiers were then transferred to British service. They fought in the Napoleonic Wars (1803–1815), mainly around the Mediterranean. They were based in Malta and then in Egypt from 1801 to 1803, fighting in Sicily and Naples. The regiment fought in the Battle of Maida in Italy in July 1806. Kept up to strength by Spanish and Portuguese recruits from 1811 to 1813, De Watteville's Regiment was involved in the Peninsular War in Spain, defending Cádiz during the Siege of Cádiz. The regiment sailed to Canada in 1813 to fight in the War of 1812. It saw service at Fort Erie and Oswego, before being disbanded in 1816.