After Atlanta fell, Confederate Gen. John Bell Hood began marching toward Nashville, Tenn., hoping to break Sherman’s supply line. Hood attacked at Union troops positioned at a railroad pass southeast of Cartersville. The Battle of Allatoona Pass on Oct. 5, 1864, is among the Civil War’s bloodiest battles, and roughly 1,600 soldiers on both sides died. The railroad has been rerouted, but the battle site now sits on the edge of Lake Allatoona and is part of Red Top Mountain State Park.