The main propose of submarines was to attack enemy ships from under the sea. With the ability to attack using self propelled torpedoes from long distances it kept the crew safe. Submarines gave the upper hand to who ever had them because that way they lost less men in ocean battles and also they could come up undetected so stealth was also on their side.
"The School of War U.S. Submarines in World War I." The School of War U.S. Submarines in World War I. N.p., n.d. Web. 12 Jan. 2015.
It was one of the most feared weapons of all of World War 1. Gas could be used even when no attack was going on at the time. Death by gas was very painful and drawn out, soldiers could escape from gun fire but once the poison gas reached a soldier they were as good as gone. This gave the upper hand to who ever posed it because with gas masks they could maneuver though the gas and over take their enemies in a matter of hours.
"Poison Gas and World War One." Poison Gas and World War One. N.p., n.d. Web. 13 Jan. 2015.
Machine guns killed the most people during the war. They were mainly used by rapidly advancing infantry troops. Each gun weighed 30kg to 60kg often without their attachments. This weapon was fairly new to warfare and made a huge difference by advancing fighting. It allowed soldiers to fire several shoots in a matter of seconds without having to stop and reload.
"Firstworldwar.com." First World War.com. N.p., n.d. Web. 13 Jan. 2015.
The tank was highly unreliable but for a new machine it was a normal thing to happen. It allowed for safe mobility between the trenches and was a big part of why the trench warfare ended. Although they didn't always work very well tanks were a big help with trenches. It allowed for close range in the safety of the bullet proof tank and the ability to take out multiple enemies at once.
"Tanks and World War One." Tanks and World War One. N.p., n.d. Web. 12 Jan. 2015.