Secretary of War Henry Knox ordered Brigadier General Josiah Harmar to launch a major offensive against the Shawnee and Miami Natives living in the region. In October 1790, his force of 1,453 men was assembled near present-day Fort Wayne, Indiana. St. Clair's army was almost annihilated during the three-hour encounter. The American casualty rate included 632 of 920 soldiers and officers killed (69%) and 264 wounded. Nearly all of the 200 camp followers were slaughtered, for a total of about 832. Wayne's soldiers advanced toward Fort Miami and on August 20, 1794, encountered Native American confederacy forces led by Blue Jacket, in what has become known as the Battle of Fallen Timbers. The first assault on Wayne's Legion was successful, but were able to regroup quickly and pressed the attack with a bayonet charge.