Charles Cornwallis was born in London and educated at Eton and Cambridge. His first military experience came in the Seven Years’ War when he was commissioned as an ensign in the British army and served in Germany. In 1760, Cornwallis was elected to the House of Commons; two years later he inherited his father’s earldom and entered the House of Lords as Earl Cornwallis.
During the 1760s and early 1770s, Cornwallis regularly spoke out against the repressive tax policies that Britain was imposing on its American colonies. However, his sympathy did not extend to support for independence and he joined British forces in America in August 1776.
Cornwallis saw action in most of the major campaigns of the War for Independence. He served with William Howe on Long Island in the late summer of 1776, then assisted in the pursuit of George Washington across New Jersey. He also was present at the American victories at Trenton and Princeton, and in September 1777 the British triumph at Brandywine. Cornwallis was impatient with Howe’s lack of initiative and was later similarly critical of Sir Henry Clinton. In frustration, Cornwallis resigned his commission, but his resignation was not accepted.
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.