Following this battle, Colonel Hobart was assigned to command three regiments of the division and Major Fitch was in command of the 21st Wisconsin. They participated in skirmishing with the enemy, pursuing them south to the vicinity of Atlanta. At this point Sherman split his army to facilitate a rapid pursuit to Atlanta while also severing key supply lines; the Confederate army at this time also changed tactics and attempted a counter-offensive against the lead unit, the Army of the Cumberland. The Confederates chose to attack at Peachtree Creek, just after the Union army had crossed and before they had a chance to establish fortifications. During the Battle of Peachtree Creek, the 10th and 21st Wisconsin regiments, under Colonel Hobart, critically drove back a Confederate attack. They were constantly engaged in skirmishing from Peachtree Creek through the Battle of Atlanta. And went into camp at Atlanta on September 8, after the Battle of Jonesborough. The Confederates made attempts to raid at the rear of the Union army and Sherman pursued him briefly to Gaylesville, Alabama, but did not engage in battle—Major Walker was in command of the regiment through this campaign, as Major Fitch had taken leave to get married.