Perfection in war lies in so sapping your opponents will that he surrenders without fighting.
Sun TzuWhen you do battle, even if you are winning, if you continue for a long time it will dull your forces and blunt you edge...If you keep your armies out in the field for a long time, your supplies will be insufficient. Transportation of provisions itself consumes 20 times the amount transported.
Sun TzuIf I am able to determine the enemy's dispositions while at the same time I conceal my own, then I can concentrate and he must divide.
Sun Tzu