Probe him and learn where his strength is abundant and where deficient.
Concentrate your energy and hoard your strength.
Rapidity is the essence of war.
Amid the turmoil and tumult of battle, there may be seeming disorder and yet no real disorder at all.
In the tumult and uproar, the battle seems chaotic, but there is no disorder, the troops appear to be milling about in circles but cannot be defeated.
To a surrounded enemy, you must leave a way of escape.