After the defeat of the French in North America, Langlade became allied with the British, who took control of former French possessions and took the lead in the fur trade in the upper West. During the American Revolutionary War, Langlade led Great Lakes Indians for the British against rebel colonists and their Indian allies. The Native Americans hoped to push the English colonists out of the region. At the end of the war, Langlade retired to his home in Green Bay, Wisconsin. Since he had operated a trading post at Green Bay since 1745 and settled there with his familyhe is called the "Father of Wisconsin."