Therefore, if we have seen Wars take place between States of very unequal power, that has been the case because there is a wide difference between War in reality and its original conception.
There are two considerations which as motives may practically take the place of inability to continue the contest.

The first is the improbability, the second is the excessive price, of success.
According to what we have seen in the foregoing chapter, War must always set itself free from the strict law of logical necessity, and seek aid from the calculation of probabilities; and as this is so much the more the case, the more the War has a bias that way, from the circumstances out of which it has arisen--the smaller its motives are, and the excitement it has raised--so it is also conceivable how out of this calculation of probabilities even motives to peace may arise.

War does not, therefore, always require to be fought out until one party is overthrown; and we may suppose that, when the motives and passions are slight, a weak probability will suffice to move that side to which it is unfavourable to give way.

Now, were the other side convinced of this beforehand, it is natural that he would strive for this probability only, instead of first wasting time and effort in the attempt to achieve the total destruction of the enemy's Army.
Still more general in its influence on the resolution to peace is the consideration of the expenditure of force already made, and further required.

As War is no act of blind passion, but is dominated by the political object, therefore the value of that object determines the measure of the sacrifices by which it is to be purchased.