 Complete the following phrase:  At the beginning of the American Civil War in 1861, Cockrell joined the Missouri State Guard as a Captain. After being mustered into the Confederate States Army in the 2nd Missouri Regiment in early 1862 which was formed as the 1st, but renumbered as Bowen had already formed a regiment; being promoted to colonel. Cockrell commanded a brigade in the Vicksburg Campaign. He distinguished himself at the Battle of Champion Hill, launching a counterattack that temporarily ousted troops of XVII Corps off the hill. He also took part in the 