General Johnston had entrenched his army on the long, steep Rocky Face Ridge and eastward across Crow Valley. When Sherman approached, he demonstrated against this position with two columns while he sent a third one through Snake Creek Gap, to the south, to hit the Western & Atlantic Railroad at Resaca. The first two columns engaged the enemy at Buzzard Roost (Mill Creek Gap) and at Dug Gap while the third column, under Maj. Gen. James B. McPherson, passed through Snake Creek Gap and on the May 9 advanced to the outskirts of Resaca, where it found Confederates entrenched. Fearing the strength of the enemy, McPherson pulled his column back to Snake Creek Gap. On May 10, Sherman decided to join McPherson in an effort to take Resaca. The next morning, Sherman's army withdrew from in front of Rocky Face Ridge. Discovering Sherman's movement, Johnston retired south towards Resaca on May 12.