“If a spirit of anger can be made to pervade all ranks of an army at one and the same time, its onset will be irresistible. Now the spirit of the enemy’s soldiers will be keenest when they have newly arrived on the scene, and it is therefore our cue not to fight at once, but to wait until their ardour and enthusiasm have worn off, and then strike. It is in this way that they may be robbed of their keen spirit.”

Giles, L. (trans) (1910) The Art of War.