WW1 MACHINE GUNS NO FURTHER A MYSTERY

The entrance-line trenches were being backed-up by second and 3rd traces: 'aid' and 'reserve' trenches. Interaction trenches linked them all together. This technique was strengthened with fortifications, underground shelters and thick belts of barbed wire.Machine Gun Blowback Devices A blowback system is a thing similar to a recoil method, besides