George Henry Thomas
During the Battle of Chickamauga in Georgia in the fall of 1863, Steedman led the vanguard of Union Maj. Gen. Gordon Granger's Reserve Corps to Maj. Gen. George Henry Thomas' aid on September 20. From his position north of the battlefield at MacAfee's Church, Granger heard the sounds of the fight to the south. Without orders from Rosecrans, Granger sent Steedman's division to support Thomas' last-ditch defensive effort as the rest of Rosecrans' defeated army raced for Chattanooga, Tennessee.