Trenches
Trenches were where soldiers were be and set up their guns, bombs, any kind of weapons, they even lived there from time to time cause they were fighting and making more trenches to get closer & closer to winning the war. the trenches were unsafe because of the bacteria that was in there and men usually got something they called "trench foot" for how unsafe they were.
Gas Masks
Air Artillery
These are the air defenses that uses Artillery in which Russia had the biggest group of air defenses than any other country& enemy.