《战国策·魏三·秦将伐魏》
然而燕国劫不去援救魏国，魏王屈节割地，把国土的一半送给秦国，秦国一定会撤兵。
而燕不救魏，魏王折节割地，以国之半与秦，秦必去矣。
However, Yan did not send troops to help Wei, King Wei had to give half of his country to Qin, Qin will definitely withdraw its troops.