Primary cause of the fourth – Anglo- Mysore war was:-
The alliance between the Nizam and the English against Tipu
With his defeat in the third Anglo-Mysore war, Tipu was burning with revenge. He wanted to get back his territory and to achieve that objective he carried on negotiations with the French and Zaman Shah of Kabul. Tipu wanted his allies to expel the English. Lord Wellesley after making Subsidiary Alliance with the Nizam asked Tipu Sultan to accept the same but he refused. Mysore was attacked from two sides. The main army under General Harris supported by Nizam's subsidiary force under Arthur Wellesley attacked Mysore from the east while another army advanced from Bombay. Tipu was at first defeated by the Bombay army and was later on defeated by the General Harris at Mallavalli. Tipu died fighting bravely. Thus the alliance between Nizam of Hydrababd and English was main reason of fourth Anglo – Mysore war. Tipu did not attack either Madras or Hyderabad to initiate the 4th Anlgo- Mysore War. Though the attack of English when Wellesley came to India on Mysore was instant but this was not the primary reason of war-.