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 ended in 1748 when the Treaty of Aix-La Chappelle was signed bringing the Austrian War of Succession to a conclusion. Under the terms of this treaty, Madras was handed back to the English, and the French, in turn, got their territories in North America.
The First Carnatic War is remembered for the Battle of St. Thome (in Madras) fought between the French forces and the forces of Anwarud- din, the Nawab of Carnatic, to whom the English appealed for help. A small French army defeated the strong Indian army at St. Thome on the banks of the River Adyar.
The Treaty of Aix-la-Chapelle, also known as the Treaty of Aachen, ended the War of the Austrian Succession in 1748. The treaty effectively ended the First Carnatic War (1746–1748). Dupleix’s French army overcame the English and took Madras.
The First Carnatic War was fought between 1746 – 1748
The real reason for the war was the outset of the war of Austrian succession in 1740 in Europe, in which England and France found themselves in contrary camps.