If the enemy is to be coerced, you must put him in a situation that is even more unpleasant than the sacrifice you call on him to make. The hardships of the situation must not be merely transient - at least not in appearance. Otherwise, the enemy would not give in, but would wait for things to improve.
Carl von ClausewitzThe political object is the goal, war is the means of reaching it, and the means can never be considered in isolation form their purposes.
Carl von ClausewitzThe Conqueror is always a lover of peace: he would prefer to take over our country unopposed.
Carl von Clausewitz