The Art of War by active 6th century B.C. Sunzi

61. By persistently hanging on the enemy’s flank,

[I understand the first four words to mean "accompanying the enemy in one direction." Ts’ao Kung says: "unite the soldiers and make for the enemy." But such a violent displacement of characters is quite indefensible.] we shall succeed in the long run [Literally, "after a thousand _li_."] in killing the commander-in-chief. [Always a great point with the Chinese.]