Defense passive. Les soupiraux des caves-abris. Les soupiraux des caves constituent des points particulierement vulnerables, par lesquels peuvent penetrer les projectiles. Un rideau de sacs de terre suffira pour remedier a ce danger. ... La disposition qui offre le plus de garantie est la suivante : 1. Disposer des planches pour fermer le soupirail exterieurement. 2. Adosser a ces planches, un massif de sacs a terre, a large base
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