S.A.J. Mallicoat went by the name Andrew during most of the Civil War where he enlisted and served two different times for the Union side. He was the first man in Greene County, Missouri to support the U.S.A. by public speech (as he stated in a letter to his brother, William) and he was the first to volunteer in Greene County for the Union side on March 24, 1862. He supplied his own equipment and horse for Co. E, 12th Missouri S.M. Calvary where he received a medical discharge on August 4, 1862, from an injury to his back.
He went home to recover and re-enlisted in December of 1863 for the duration of the war effort with Battery Co. I, 2nd Missouri Light Artillery. He was 35 years old and is listed with fair complexion, blue eyes, light hair, and 5 ft, 11 inches tall. He was a Mechanic* by trade.
As the war progressed and after two years of conflict he "deserted" or left without leave on April 21, 1864 in New Madrid, Missouri and was arrested May 6, 1864 in Greene County, Missouri. His wife had just had a baby boy in January of 1864 and he may have wanted to go see his son, named Andrew Jackson Mallicoat. By July of 1864 he is absent again and in arrest in St. Louis, Missouri and is placed in the Myrtle Street Prison. In July of 1865 he is absent and sick at the Post Hospital Benton Barracks, Missouri with "Rheumatism". He returned to duty August 24, 1865.
*Mechanic at this time (in 1860) was really a broad field that covered just about anything that wasn't horse powered or slave-powered (as there was not much in the way of farm equipment back then). If anything required maintenance that was mechanical in nature, he would provide that service.