《资治通鉴·唐纪·唐纪四十三》
倘若我军分兵进击敌军左右两翼，田悦必定援助，我军便会腹背受敌，打起来一定不利于我军。
我若分军击其左右，悦必救之，则我腹背受敌，战必不利。
If our army divides its troops to attack the enemy's left and right wings, Tian Yue will definitely come to their aid, and our army will be attacked on both fronts, which will definitely be不利于我军。