The term 'YANKEE's Foe' can be solved by two crossword solutions: REB (3 letters) and REBEL (5 letters). The term refers to the Confederate forces during the American Civil War, which was fought between the Union (Northern) states and the Confederate (Southern) states. The term 'REBEL' is a shortened version of the term 'Confederate REBEL' and the term 'REB' is an abbreviation for the same. Therefore, the two crossword solutions for the term 'YANKEE's Foe' refer to the Confederate forces that fought against the Union forces during the American Civil War.