ourselves, we can keep our forces concentrated, while the enemy’s must
be divided.
[The conclusion is perhaps not very obvious, but Chang Yu (after Mei
Yao-ch’en) rightly explains it thus: "If the enemy’s dispositions are
visible, we can make for him in one body; whereas, our own dispositions
being kept secret, the enemy will be obliged to divide his forces in
order to guard against attack from every quarter."]