Carnatic was the name given by the Europeans to the Coromandel coast and its hinterland. The First Carnatic War was an extension of the Anglo-French War in Europe which was caused by the Austrian War of Succession.
The First Carnatic War is remembered for the Battle of St. Thome (in Madras) fought between the French forces and the forces of Anwar-ud-din, the Nawab of Carnatic, to whom the English appealed for help.
Although France, conscious of its relatively weaker position in India, did not favour an extension of hostilities to India, the English navy under Commodore Curtis Bennett seized some French ships to provoke France.
France retaliated by seizing Madras in 1746 with the help of the fleet from Mauritius, the Isle of France, under Admiral La Bourdonnais, the French governor of Mauritius.
A small French army under Captain Paradise defeated the strong Indian army under Mahfuz Khan at St.Thome on the banks of the River Adyar.
The First Carnatic War ended in 1748 when the Treaty of Aix-La Chapelle was signed bringing the Austrian War of Succession to a conclusion.
War was an eye-opener for the Europeans in India: it revealed that even a small disciplined army could easily defeat a much larger Indian army.