The Battle of Shiloh, also known as the Battle of Pittsburg Landing, was a major battle in the Western Theater

Western Theater of the American Civil War

This article presents an overview of major military and naval operations in the Western Theater of the American Civil War.-Theater of operations:...

 of the American Civil War

American Civil War

The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

, fought April 6–7, 1862, in southwestern Tennessee

Tennessee

Tennessee is a U.S. state located in the Southeastern United States. It has a population of 6,346,105, making it the nation's 17th-largest state by population, and covers , making it the 36th-largest by total land area...

. A Union

Union Army

The Union Army was the land force that fought for the Union during the American Civil War. It was also known as the Federal Army, the U.S. Army, the Northern Army and the National Army...

 army under Maj. Gen.

Major general (United States)

In the United States Army, United States Marine Corps, and United States Air Force, major general is a two-star general-officer rank, with the pay grade of O-8. Major general ranks above brigadier general and below lieutenant general...

 Ulysses S. Grant

Ulysses S. Grant

Ulysses S. Grant was the 18th President of the United States as well as military commander during the Civil War and post-war Reconstruction periods. Under Grant's command, the Union Army defeated the Confederate military and ended the Confederate States of America...

 had moved via the Tennessee River

Tennessee River

The Tennessee River is the largest tributary of the Ohio River. It is approximately 652 miles long and is located in the southeastern United States in the Tennessee Valley. The river was once popularly known as the Cherokee River, among other names...

 deep into Tennessee and was encamped principally at Pittsburg Landing on the west bank of the river. Confederate

Confederate States Army

The Confederate States Army was the army of the Confederate States of America while the Confederacy existed during the American Civil War. On February 8, 1861, delegates from the seven Deep South states which had already declared their secession from the United States of America adopted the...

 forces under Generals Albert Sidney Johnston

Albert Sidney Johnston

Albert Sidney Johnston served as a general in three different armies: the Texas Army, the United States Army, and the Confederate States Army...

 and P. G. T. Beauregard

P. G. T. Beauregard

Pierre Gustave Toutant Beauregard was a Louisiana-born American military officer, politician, inventor, writer, civil servant, and the first prominent general of the Confederate States Army during the American Civil War. Today he is commonly referred to as P. G. T. Beauregard, but he rarely used...

 launched a surprise attack on Grant there.