Congress enacted its most important piece of legislation, the Northwest Ordinance, during St. Clair's tenure as president. Time was running out for the Confederation Congress, however; during St. Clair's presidency, the Philadelphia Convention was drafting a new United States Constitution, which would abolish the old Congress. Northwest Territory Under the Northwest Ordinance of 1787, which created the Northwest Territory, General St. Clair was appointed governor of what is now Ohio, Indiana, Illinois, Michigan, along with parts of Wisconsin and Minnesota. He named Cincinnati, Ohio, after the Society of the Cincinnati, and it was there that he established his home. As Governor, he formulated Maxwell's Code (named after its printer, William Maxwell), the first written laws of the territory. He also sought to end Native American claims to Ohio land and clear the way for white settlement. In 1789, he succeeded in getting certain Native Americans to sign the Treaty of Fort Harmar, but many native leaders had not been invited to participate in the negotiations, or had refused to do so. Rather than settling the Native Americans' claims, the treaty provoked them to further resistance in what is also sometimes known as the "Northwest Indian War" (or "Little Turtle's War"). Mutual hostilities led to a campaign by General Josiah Harmar, whose 1,500 militiamen were defeated by the Native Americans in October 1790. 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. One month later, near modern-day Fort Recovery, his force advanced to the location of Native American settlements near the headwaters of the Wabash River, but on November 4 they were routed in battle by a tribal confederation led by Miami Chief Little Turtle and Shawnee chief Blue Jacket. They were aided by British collaborators Alexander McKee and Simon Girty. More than 600 soldiers and scores of women and children were killed in the battle, which has since borne the name "St. Clair's Defeat", also known as the "Battle of the Wabash",