 Tecumseh continued to play a major role in military operations on the frontier.By the time that the U.S. declared war on Great Britain in the War of 1812, Tecumseh's confederacy was ready to launch its own war against the United States—this time with the British in open alliance.Tecumseh's warriors made up nearly half of the British forces that captured Detroit from the United States in the War of 1812, and it was not until Tecumseh's death at the 1813 Battle of the Thames that his confederacy ceased to threaten the Americans.