If you march fifty _li_ in order to outmanœuvre the enemy, you will
lose the leader of your first division, and only half your force will
reach the goal.
蹶 is explained as similar in meaning to 挫: literally, “the leader
of the first division will be _torn away_.” Cf. Tso Chuan, 襄 19th
year: 是謂蹶其本 “This is a case of [the falling tree] tearing up
its roots.”