contributions of Cornwallis as Governor General

The defeat at Yorktown did not destroy Cornwallis’s career. In 1786, he was appointed governor-general of India, where he brought important reforms to the civil service and the judiciary. He also instituted a major land reform and led military campaigns against native uprisings. In 1792, he was made a marquess for his service in India.
In 1798, Cornwallis became viceroy and commander-in-chief in Ireland. He won some measure of respect from both Roman Catholics and Protestants for his sincerity and dedication. Other contributions included quelling a rebellion in 1798 and thwarting a French invasion. He supported the Act of Union in 1801, which joined the British and Irish in Parliament, but resigned when the king failed to guarantee political rights for Catholics.

Lord Cornwallis's greatest contribution, besides the Permanent Settlement, to the building of the British empire in India was his military measures for containing Tipu Sultan of Mysore. In 1790 he personally commanded a military campaign against the Mysore ruler and annexed a strategic part of his kingdom to the Company State. By defeating Tipu Sultan and forcing him to accept a dictated peace treaty, Cornwallis had significantly extended the security frontiers of the company. In fact, his victory over Tipu Sultan had paved the way to the empire building process of Lord Wellesley. Cornwallis's military success and his success in making the company kingdom strong administratively, judicially and militarily earned him the title of First Marquis in August 1792.


Sources:
http://www.u-s-history.com/pages/h1304.html

http://66.102.9.104/search?q=cache:oIHtk0qsuiIJ:banglapedia.search.com.bd/HT/C_0354.htm+contribution+of+cornwallis+as+governor+general&hl=en&ct=clnk&cd=2&gl=uk