If the mind is willing, the flesh could go on and on without many things.
Attack where he is unprepared; sally forth when he does not expect you.
There are roads which must not be followed, armies which must not be attacked, towns which must not be besieged, positions which must not be contested, commands of the sovereign which must not be obeyed.
Who can determine where one ends and the other begins?
Agitate him and ascertain the pattern of his movement.
Victory is the main object in war.