 The Meuron Regiment subsequently served in the Fourth Anglo-Mysore War of 1799, the Mediterranean, and Peninsula Campaigns of the Napoleonic Wars 1806 to 1812.The first mention of the regiment in combat for the British was during the siege of Seringapatam in 1799.Over time, especially by the time of the Peninsular campaigns, difficulties in obtaining replacements from Switzerland led to the regiment recruiting some Spanish and Portuguese recruits.