 Complete the following phrase:  At the outbreak of the Civil War in 1861, Gates enlisted in the Confederate Army, starting as a captain in the Missouri State Guard under the command of General Sterling Price, and was later promoted to colonel of the 1st Missouri Cavalry Regiment. He commanded his regiment at the Battle of Pea Ridge, Arkansas in March 1862, during the Siege of Corinth, Mississippi, and at the Battles of Iuka, Second Corinth, 