Congress established Shiloh National Military Park on December 27, 1894 to commemorate the April 6-7, 1862 battle that raged around Shiloh Church and Pittsburg Landing. Producing more than 23,000 casualties, the battle was the largest engagement in the Mississippi Valley campaign during the Civil War. Originally under the War Department, Shiloh National Military Park was transferred to the National Park Service in the Department of the Interior in 1933.