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A selected land area sown with explosive charges, mines, and other available obstacles to deny use of the land to enemy operations, and as a protection to friendly troops. There are two types of demolition belts: a. primary. A continuous series of obstacles across the whole front, selected by the division or higher commander. The preparation of such a belt is normally a priority engineer task. b. subsidiary. A supplement to the primary belt to give depth in front or behind or to protect the flanks.