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A speedy victory is the main object in war. If this is long in coming, weapons are blunted and morale depressed. …
When the army engages in protracted campaigns, the resources of the state will fall short.
When your weapons are dulled and ardor dampened, your strength exhausted and treasure spent, neighboring rulers will take advantage of your crisis to act. In that case, no man, however wise, will be able to avert the disastrous consequences that ensue.
Thus, while we have heard of stupid haste in war, we have not yet seen a clever operation that was prolonged. for there has never been a protracted war which benefited a country.
Therefore, those unable to understand the dangers inherent in employing troops are equally unable to understand the advantageous ways of doing so.