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Message * Articles On Fortification, including Abatis, Citadel, Crannóg, Gate, Kremlin, Medieval Fortification, Siege, Offa's Dyke, Trebuchet, Glacis, Barbed Tape, Castle, Cartagena, Colombia, Bunker, Box Tunnel, Naarden, Defensive Wall, Moat - 1244123536 - 9781244123533