The term CIVIL WAR GRP. refers to two groups that were involved in the American Civil War, which took place from 1861 to 1865. The first group is the Grand Army of the Republic (GAR), which was a fraternal organization composed of veterans of the Union Army, Navy, Marines, and Revenue Cutter Service who served in the American Civil War. The second group is the Confederate States Army (CSA), which was the military land force of the Confederate States of America during the American Civil War.