Shiloh National Military Park in Tennessee preserves the scene of the first major battle in the western theater of the Civil War. The two-day battle took place on April 6 and 7, 1862, and involved about 65,000 Union and 44,000 Confederate troops. Despite surprise attacks and some advances by the Confederates on the first day, the Union forces were able to gain advantage and force the Confederates to withdraw and join up with more of their forces at Corinth, Mississippi. The Shiloh battle resulted in nearly 24,000 killed, wounded, and missing. It proved to be a decisive victory for the Union forces, allowing them to then advance on to, and seize control of, the Confederate railway system in Corinth. The battlefield contains about 4,000 acres and has within its boundaries the Shiloh National Cemetery, along with well-preserved prehistoric Indian mounds that are also listed as an historic landmark.