He won victories in the Indiana Territory as well as Ohio and recaptured Detroit before invading Upper Canada (Ontario). His army defeated the British, and Tecumseh was killed, on October 5, 1813, at the Battle of the Thames. It was considered to be one of the great American victories in the war, second only to the Battle of New Orleans, and secured a national reputation for Harrison.[69][5]
In 1814, Secretary of War John Armstrong divided the command of the army, assigning Harrison to an outlying post and giving control of the front to one of Harrison's subordinates.[70] Armstrong and Harrison had disagreed over the lack of coordination and effectiveness in the invasion of Canada, and Harrison resigned from the army in May.[71][72] After the war ended, Congress investigated Harrison's resignation and determined that Armstrong had mistreated him during his military campaign and that his resignation was justified. Congress awarded Harrison a gold medal for his services during the war.[73]
Harrison and Michigan Territory's Governor Lewis Cass were responsible for negotiating the peace treaty with the Indians.