General Johnston informed his senior officers that the Army of Tennessee had no choice but to fall back from Resaca or be cut off from Atlanta. Under the cover of darkness, the Army of Tennessee fell back and crossed the Oostanaula River toward Calhoun and Adairsville. In the early morning hours of May 16th, the Confederates set fire to the railroad span crossing the Oostanaula and a nearby wagon bridge to prevent it from falling into Federal hands. By early afternoon of the 16th, the Federals had repaired the damaged bridges and Howard's IV corps was in pursuit of the Confederates. Thus ended the first major battle of the Atlanta Campaign.
Some estimates are even higher.
Quarles' Brigade, Walthall's Division, Polk's Army Corps. Quarles' Brigade, Walthall's Division, Polk's Army Corps. Quarles' Brigade, Walthall's Division, Polk's Army Corps. Quarles' Brigade, Walthall's Division, Polk's Army Corps. Quarles' Brigade, Walthall's Division, Polk's Army Corps.