 Jackson gathered his forces at Fort Scott in March 1818, including 800 U.S. Army regulars, 1,000 Tennessee volunteers, 1,000 Georgia militia, and about 1,400 friendly Lower Creek warriors (under command of Brigadier General William McIntosh, a Creek chief).On March 15, Jackson's army entered Florida, marching down the banks of the Apalachicola River.When they reached the site of the Negro Fort, Jackson had his men construct a new fort, Fort Gadsden.