《左传·庄公·庄公十年》
说完就下了战车，察看齐军车轮碾出的痕迹，又登上战车，扶着车前横木远望齐军的队形，这才说： 可以追击了。 
下视其辙，登轼而望之，曰： 可矣。 
After saying this, he left his chariot, inspected the traces left by the Qi army's wheels, then returned to his chariot, held onto the crossbar in front of the chariot and looked far out at the Qi army's formation, only then did he say: We can pursue them. 