兵不厌诈（Bīng Bù Yàn Zhà）

The army does not detest deception意思是在战争中，不能厌恶欺骗和计谋。只有聪明地运用策略，才能取得胜利。means that in war, one cannot dislike or avoid deception and stratagems. Only by cleverly using tactics and strategies can one achieve victory.