《宋史·列传·卷七十七》
我方应该屯兵河东，轻装直进，这就是攻其所必救，使敌处于被动的打法。 宰相吕夷简赞同这一策略而没有实际采用。
宜屯兵河东，卷甲而趋之，所谓攻其所必救，形格势禁之道也。 宰相吕夷简善其策而不果行。
Our side should station soldiers in Hedong, traveling light and advancing straight in, so that the enemy would have to come to save their lair, which would put the enemy in a passive position to fight. Prime Minister Lv Yijian approved of this strategy but did not end up employing it.