The term YANK's Civil War Foe refers to the Confederate forces, also known as the Rebels or Rebs, who fought against the Union forces during the American Civil War. The Confederate forces were often referred to as 'YANK's Civil War Foe' due to their opposition to the Union forces, which were commonly referred to as 'YANKS'. The abbreviations for the Confederate forces are REBS (4 letters) and REB (3 letters).