ww1

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…somewhat larger and were situated far from the front line. These usually contained a barracks of some sort where the soldiers lived. (Fletcher) A network of the various types of trenches made up the key element for the strategy of trench warfare. Having two or three fire trenches behind the front line, backed up by the specialized weapons in a back bunker, all linked with a retreat trench, became a highly complex defensive setup. (Lavarone)