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In The First Anglo-Mysore war, Hyder Ali defeated the forces of East India company in Madras and the British agreed to help Hyder Ali in case of an attack from the Marathas. In 1771, however, when Marathas attacked Mysore, the British did not come to their help as promised. The Second Anglo-Mysore War was caused because the British captured the French possessions at Mahe, which were under the protection of Haidar Ali. This angered Haidar Ali and he challenged the British. Haidar Ali died in this war, and his son Tipu Sultan continued to fight. The war came to an end in 1784. Both the parties signed the Treaty of Mangalore and agreed to return the conquered territories of each other. The Third Anglo Mysore War In 1785, Tipu Sultan prohibited local merchants from trading with the British. He also banned the export of sandal wood and spices from the ports under his control. This angered the British. Lord Cornwallis, the then Governor General joined hands with the Marathas and the Nizam of Hyderabad and attacked Tipu Sultan. This war was known as the Third Anglo Mysore war. In this war, the British took two of his sons as hostages and defeated Tipu Sultan. Tipu was made to give them half of his territory under the Treaty of Seringapatam. The Fourth Anglo Mysore War In 1799, Lord Wellesley, the then Governor General of India defeated Tipu in the fourth Anglo-Mysore war also known as the Battle of Seringapatam. Tipu died in this battle defending his capital, Seringapatam and the Briitish annexed half of his kingdom. Mysore was given back to the royal family. They forced new ruler of Mysore to enter into subsidiary alliance. This victory led them towards the total control of India by the British.