Earl Van Dorn

Earl Van Dorn (September 17, 1820 – May 7, 1863) started his military career as a United States Army officer but joined Confederate forces in 1861 after the Civil War broke out. He was a major general when he was killed in a private conflict.
He was notable for fighting with distinction during the Mexican–American War, and against several tribes of Native Americans in the West. During the American Civil War, he allied with the Confederacy, fighting in the Western Theater as a Confederate major general. As a great-nephew of Andrew Jackson, he had gained an appointment to West Point Academy, where he graduated in 1842.
In the American Civil War, he served as a Confederate general, appointed commander of the Trans-Mississippi District. At the Battle of Pea Ridge, Arkansas, in early March 1862, he was defeated by a smaller Union force. He had abandoned his supply-wagons for the sake of speed, leaving his men under-equipped in cold weather. At the Second Battle of Corinth in October 1862, he was again defeated through a failure of reconnaissance, and was removed from high command. He scored two notable successes as a cavalry commander, capturing a large Union supply depot in the Holly Springs Raid and an enemy brigade at the Battle of Thompson's Station, Tennessee. Van Dorn's successful raid of Holly Springs delayed the potential expulsion of Jewish people from Grant's military district.
Van Dorn's reputation was regained but short-lived. In May 1863, he was shot dead at his headquarters at Spring Hill by a doctor who claimed that Van Dorn had carried on an affair with his wife.
https://en.wikipedia.org/wiki/Earl_Van_Dorn