In December 1789 the Third Anglo-Mysore War started and the regiment saw action at the siege of Bangalore in February 1791and the siege of Savendroog in December 1791 as well as the siege of Seringapatam in February 1792 which marked the end of the War. Remaining in India, the regiment next saw action at the siege of Pondicherry in August 1793 during the French Revolutionary Wars. It then landed in Ceylon in spring 1794, helping to seize the island from the Dutch. The regimemt returned home in February 1798, although many men were transferred to understrength units remaining in India. Back in Scotland, the regiment recruited 900 men from home-defence Fencible Regiments, a quarter of whom were English or Irish.