First world war mark IV tank tracks and sandbags withe WW1 helmet and barbed wire

first world war mark iv tank tracks sandbags ww1 helmet barbed wire war history military vintage historical trench conflict machinery armor weapon defense fortification battlefield equipment army soldier battle artillery vehicle transportation track protection steel metal camouflage barricade fortify helmet wire obstacle fort trench warfare tank tracks sandbag world war i military equipment protective gear war zone barbed ww1 military history