 Complete the following phrase:  After graduating from the United States Military Academy at West Point, Longstreet served in the MexicanAmerican War. He was wounded in the thigh at the Battle of Chapultepec, and during recovery married his first wife, Louise Garland. Throughout the 1850s, he served on frontier duty in the American Southwest. In June 1861, Longstreet resigned his U.S. Army commission and joined the Confederate Army. He commanded Confederate troops during an early victory at 