Chapter: Maneuvering 7.11
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We may take it then that an army without its baggage-train is lost; without provisions it is lost; without bases of supply it is lost.

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An army, as they say, marches on its stomach. Supplies of food and all the other requirements of living keep the army not just alive but motivated and strong.

Short maneuvers work without a supply line, but they cannot hold out forever, and so need the main force to catch up soon.