 This was followed by forty years of constant warfare against the Sultans of Mysore, and then the Marathas chieftains.In the Second Maratha War of 1803–05, the 1st and 10th Battalions fought in the Battle of Assaye under General Arthur Wellesley, the future Duke of Wellington, while the 4th Battalion fought in the Battles of Laswari and Agra in 1803, and Bhurtpore in 1805.The performance of the 1st and 10th at Assaye was much appreciated and they were permitted the word "Assaye" with the device of an elephant on their colours and appointments.