保安軍！
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從1934年開始，國民政府采取德國顧問團的建議，以首都南京為中心，逐次向華北和東南沿海擴展修築永固國防工事。以鋼筋混凝土築成的地面步兵陣地能夠抵御日軍15厘米口徑炮彈和500磅炸彈的轟擊，地下工事能夠抵御1000磅以上炸彈的轟擊。這種陣地一般包括主陣地、前進陣地和後方陣地三部分。各陣地的編成，多封陽孤後克
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