The Carnatic wars were three wars fought in South India in the middle of the 18th century between the English East India Company and the French East India Company and their Indian allies.
First Carnatic War (1746-1748): In this war, the French defeated the English in the struggle to control the eastern coast of India, mainly present day Tamil Nadu. The English lost Madras to the French. The war led to the rapid expansion of French influence on the eastern coast of India.
Second Carnatic war (1749-1754): This was ended with victory for the British who managed to install their ally, Muhammad Ali Khan Walajah, as the Nawab of the Carnatic.
Third Carnatic war (1756-1763): This was the most important of the three Carnatic wars. The French were decisively defeated in this war. Under the treaty signed after this war, the French were allowed to keep Pondicherry and Chandernagore, but were forbidden to expand their territories any further. With this war, the dreams of a French empire in India vanished. The British became the dominant European power in India.