The term 'BEGIN A BATTLE' can be summarized by two crossword solutions: ATTACK (6 letters) and ENGAGE (6 letters). ATTACK is an aggressive action that initiates a battle, while ENGAGE is a more formal term for entering into a conflict. Both terms are used to describe the beginning of a battle, but they have slightly different connotations. ATTACK implies a sudden, violent action, while ENGAGE implies a more organized and planned approach.