The 103rd with the rest of Sherman's command continued westward after the Battle of Chattanooga to relieve General Ambrose Burnside, whose army was besieged by Confederate general James Longstreet at Knoxville. Finding that Longstreet had already given up on the siege by the time they arrived in Knoxville, Sherman returned to Chattanooga. During the winter of 1863-1864, the 103rd spent time in winter quarters and guard duty in Cleveland, Tennessee. They rejoined the XV Corps just in time to participate in the Atlanta Campaign beginning on May 3, 1864. They were lightly engaged at the Battle of Resaca on May 14, losing one man killed and several wounded and participated heavily in the Battle of Dallas two weeks later. Among the slain was the regimental commander, Colonel Willard A. Dickerman who was mortally wounded.