In March 1791, St. Clair succeeded Harmar as commander of the United States Army and was commissioned as a major general. He personally led a punitive expedition involving two Regular Army regiments and some militia. In October 1791 as an advance post for his campaign, Fort Jefferson (Ohio) was built under the direction of General Arthur St. Clair. Located in present-day Darke County in far western Ohio, the fort was built of wood and intended primarily as a supply depot; accordingly, it was originally named Fort Deposit.