Confederate Army
From Memory Alpha, the free Star Trek reference.
General Robert E. Lee was the most successful military leader of the Confederate Army. The Army also captured the US Navy ship Merrimack, which was later called CSS Virginia. (TOS: "The Cage")
Among the many battles of the Confederate Army was the Battle of Pine Mountain. (VOY: "Death Wish")
During the Q Civil War in 2373 the side led by the Q colonel advocating a status-quo within the Q Continuum appeared as soldiers of the Confederate Army when presenting themselves to "lower" species while the side led by Q appeared as soldiers of the Union Army. (VOY: "The Q and the Grey")
