《宋史·列传·卷一百一十七》
而且敌兵号称六万，但我们已集聚到开封城下的勤王兵有二十多万；他金人以孤军深入重地，好比如虎豹自投栅栏，应该用计谋俘获他，而没有必要和他拼一时的气力。
且敌兵号六万，而吾勤王之师集城下者已二十余万；彼以孤军入重地，犹虎豹自投槛阱中，当以计取之，不必与角一旦之力。
Furthermore, the enemy claims to have 60,000 soldiers, but we have already gathered 200,000 reinforcement troops at Kaifeng city; the Jurchens have ventured deep into our territory with only a small army, just like a tiger or a leopard walking into a cage; we should use our wits to capture them, and it is unnecessary to fight them head-on.