《金史·列传·卷四十六》
打了前仗得胜，后仗必定更换作战方法，这是担心被敌人所事先料定，何况并未取胜呢！
夫前阵虽胜，而后必更者，恐为敌所料耳，况不胜哉。
If the battle before was victorious, then in the battle after they would definitely change the method of fighting, this is due to the concern that the enemy will guess in advance, moreover, have they even achieved victory!