British Army Gas Helmet by John Brooke is licensed under Public Domain. The gas helmet was used to protect by deadly chemical gasses used in WW1. These had glass eyepieces and a rubber tube that you would breath through. Also the helmets sometimes could be uncomfortable to wear.
Entrenching Tool by Andshel licensed under Creative Commons Attribution-Share Alike 4.0 International. Its a tool that they would use to dig ditches to live in and to protect them. It would protect them from lethal weapons and bullets. The entrenching tool was also used in hand-to-hand combat.
WW1 Steel helmet by Joshua R. Murray is licensed under Creative Commons Attribution-Share Alike 3.0 Unported. It was used to protect against machine guns, rifle fires, and artillery. Also blocked objects falling from the sky going into their head. They also reduced head injuries by 5 percent.
Mosquito Net by Sheerer, Theodor licensed under Creative Commons Attribution-Share Alike 3.0 Germany. A mosquito net helped the soldiers not to catch a disease form mosquito's and other insects. It also lowered the rate of people dying from non-battle deaths. The nets were given off to British troops to protect form Malaria.
Brosnan, Matt. “10 Things That Could Have Saved Your Life in the Trenches.” Imperial War Museum, www.iwm.org.uk/history/10-things-that-could-have-saved-your-life-in-the-trenches. Accessed 26 Mar. 2017.