Reserve

In army affairs, is a body of troops held somewhere in the rear, generally out of fire, and kept fresh, in order that they may interfere with decisive force at any point where yielding troops require support, or an advantage gained needs powerful following up. The reserve of ammunition is a magazine of warlike stores, situated between an army and its base of operations, sufficiently retired from the front to be safe from sudden raids of the enemy, and at the same time advanced enough to allow of the supply actually in the field being speedily replenished.