During the course of the American Revolutionary War, United States forces captured outposts in the lower areas of the territory, but British forces maintained control of Fort Lernoult (Detroit). In September 1778, the United States negotiated the Treaty of Fort Pitt and secured Delaware support for an attack on Detroit the following month. The campaign was abandoned after the death of Lenape leader White Eyes. Additional actions in the Western theater of the American Revolutionary War further damaged relations between the United States and many of the region's native inhabitants. In 1780, British and Native American forces swept across the Midwest to clear the territories of rebels and Spanish forces, attacking St. Louis and Cahokia and Kentucky, but were repulsed in both battles. Within months, General George Rogers Clark retaliated by crossing the Ohio River and attacking Shawnee towns Chillicothe and Piqua. That same year, French officer Augustin de La Balme led a militia force towards Fort Detroit, stopping to sack Kekionga along the way. The Miami tribes, which had been divided in their allegiances during the Revolution, now joined against the United States, and the retaliation against La Balme's militia launched the military career of an obscure Miami warrior named Mihšihkinaahkwa, known as Little Turtle. The following year, British and Native American forces attacked Fort Laurens, a U.S. fort in the Ohio Territory.