A fierce battle took place at Stones River between December 31, 1862 and January 2, 1863. General Bragg's Confederates withdrew after the battle, allowing General Rosecrans and the Union army to control middle Tennessee. Although the battle was tactically indecisive, it provided a much-needed boost to the North after the defeat at Fredericksburg. The 600-acre National Battlefield includes Stones River National Cemetery, established in 1865, with more than 6,000 Union graves; and the Hazen Brigade Monument, believed to be the oldest, intact Civil War monument still standing in its original location. Leashed pets are permitted in the park, but are not allowed in the buildings. Leashes must be no longer than six feet. Pets may not be left unattended.