Albert Sidney Johnston (February 2, 1803 – April 6, 1862) was a Confedeate general during the American Civil War. He was born in 1803 in Tennessee. He graduated from the United States Military Academy in 1826. He resigned from the U.S. army in 1834 after his wife died. He then joined the Texas army during the Texas Revolution and continued serving in it after Texas became a republic. In 1840 he resigned from the Texas army and moved to Kentucky.
Johnston rejoined the U.S. army for the Mexican–American War. By 1860 he was in charge of the U.S. army in California. He resigned in May 1861 after Texas joined the Confederate States of America. He was made a four star general in the Confederate army and put in charge of the Confederate units in Kentucky and Tennessee. He was killed at the Battle of Shiloh on April 6, 1862.