The term 'Rebel Yell' is a phrase associated with the Confederate Army during the American Civil War. The phrase was used to describe the loud battle cry of the Confederate soldiers as they charged into battle. The crossword solutions for this term are WAHOO (5 letters) and NEVER (5 letters). WAHOO is an exclamation of joy or triumph, while NEVER is used to express negation or refusal. Together, these two words can be used to describe the Rebel Yell, which was a loud and passionate battle cry that expressed the determination of the Confederate soldiers.