King George's War (1744–1748) is the name given to the military operations in North America that formed part of the War of the Austrian Succession (1740–1748). It was the third of the four French and Indian Wars. It took place primarily in the British provinces of New York, Massachusetts Bay, New Hampshire, and Nova Scotia. Its most significant action was an expedition organized by Massachusetts Governor William Shirley that besieged and ultimately captured the French fortress of Louisbourg, on Cape Breton Island in Nova Scotia, in 1745.
The Treaty of Aix-la-Chapelle ended the war in 1748 and restored Louisbourg to France, but failed to resolve any outstanding territorial issues.