Don Carlos Buell was a United States Army officer who fought in the Seminole War, the Mexican–American War, and the American Civil War. Buell led Union armies in two great Civil War battles—Shiloh and Perryville. The nation was angry at his failure to defeat the outnumbered Confederates after Perryville, or to secure East Tennessee. Historians generally concur that he was a brave and industrious master of logistics, but was too cautious and too rigid to meet the great challenges he faced in 1862. Buell was relieved of field command in late 1862 and made no more significant military contributions until his resignation in 1864.

The Battle of Shiloh, also known as the Battle of Pittsburg Landing, was a major battle in the American Civil War fought on April 6–7, 1862. The fighting took place in southwestern Tennessee, which was part of the war's Western Theater. The battlefield is located between a small, undistinguished church named Shiloh and Pittsburg Landing on the Tennessee River. Two Union armies combined to defeat the Confederate Army of Mississippi. Major General Ulysses S. Grant was the Union commander, while General Albert Sidney Johnston was the Confederate commander until his battlefield death, when he was replaced by his second-in-command, General P. G. T. Beauregard.