August 7, 1864, the unit was reassigned to operations against Sheridan's Campaign in the Shenandoah Valley where the 18th Georgia saw many small battles. August 16, they were engaged at Cedarville, and Guard Hill (Front Royal), Virginia. They next saw action at Bunker Hill, West Virginia September 2 and 3rd. On September 19, they saw action in the Battle of Opequan in Winchester, Virginia. Three days later, on the 22nd, the regiment saw action at the Battle of Fisher's Hill near Strasburg, Virginia. And lastly, on October 19, 1864, the unit saw action in the Battle of Cedar Creek, Middletown, and Belle Grove, Virginia.