春秋时期,楚国和宋国争霸。楚国人想要先发制人,对宋国发起突然袭击。不过要偷袭的话,必须要先渡过两国之间的澭水才行。为了偷渡澭水,楚国人想了个办法,事先派人逐段测量好澭水的深度,选择好了一处最浅的、方便行动的河段,并且做好了标志来引导军队从这里渡河。到了行动那天夜晚,楚国军队依照计划悄悄来到岸边,可是一下水才发现此地的水流又深又急,和事先测量好的情况完全不 Spring and Autumn Period, Chu and Song for hegemony. The Chu people want to preempt and attack Suddenly. However, if you want to attack, you must first swim through the water between the two countries. In order to smuggled water, the Chu people thought of a way to dispatch people in advance to measure the depth of swill, select the lightest and most convenient river, and mark it to guide the army from here Cross the river. By the night of the operation, the army of Chu had quietly came to the shore according to the plan, but once the water was found, the flow of water in this place was deep and urgent, and the situation well measured in advance was completely unnoticed