Purniah attended every military campaign Tipu Sultan led. In the Third Anglo-Mysore War of 1792, Purniah commanded a rocket units (131 men). In his last battle with the British, Tipu had entrusted his eldest son and heir-apparent to Purniah's care. In the Fourth Anglo-Mysore War, Purniah commanded the forces of Mysore against the English in some of the battles including Battle of Sultanpet Tope. Tipu died on the battlefield in 1799.