Second-echelon

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In military strategy, specifically deep battle doctrine, second-echelon forces are arrayed behind first-echelon forces. First-echelon forces occupy the front and come into immediate contact with the enemy at the outbreak of hostilities and second-echelon forces are used as a strategic reserve to reinforce weak points and exploit breakthroughs. NATO strategy in Europe revolved around AirLand battle doctrine which aimed at pinning second-echelon forces so first-echelon forces could be decisively defeated.