The purpose of ppison gas was to kill people witgout troops being there. It was especially used in the trench warfare because it was dangerous for people to even take a breath of fresh air. Poison Gas was deadly because you could not hide from it, it spread and killed masses of people at a time. It revolutionized warfare because it gace poeple a new way of fighting without people.
The machine gun allowed people to fight and shoot people without reloading everytime they shot. Machine guns helped war but often people who used them did not live very long after.
The Tanks in World War I made a big impact. They were known to be highly unreliable but they made a big difference in trench warfare.
The submarines made a big impact in WWI for the first time . They were used as U-boats in WWI
"WW1 Submarines | WW1 Facts." WW1 Facts. N.p., n.d. Web. 12 Jan. 2015.
"Firstworldwar.com." First World War.com. N.p., n.d. Web. 10 Jan. 2015.