The term REB'S FOE can be solved by two crossword solutions: YANK (4 letters) and YANKEE (6 letters). YANK is a slang term for an American soldier, especially one from the Union Army during the American Civil War. YANKEE is a nickname for an American or a citizen of the United States, derived from the Dutch Jan Kees, which means John Cheese. Therefore, REB'S FOE can be interpreted as referring to a soldier from the Union Army during the American Civil War.