WWI Trench Warfare by Btb.jo is licensed under Creative Commons Attribution-Share Alike 4.0 International
WWI Gas Mask by Luz28 is licensed under Creative Commons CC0 1.0 Universal Public Domain Dedication
Chemical weapons were used on a major scale during 1915 by the Germans. Early gas masks were just cotton soaked with chemicals, but as the weapons developed, so did the masks. The cotton masks turned into the "tube" helmet, which evolved into the Small Box Respirator mask, which was the most effective of the wartime gas masks ("10 Things").
Romania Steel Helmet, Model 1915 Adrian Type- National World War I Museum- Kansas City, MO by Daderot licensed by the public domain.
When soldiers were in the trenches, the most vulnerable part of their body was their head. Before steel helmets were issued in 1916, the British army offered soft cloth caps which did nothing whatsoever to protect the soldiers heads. They ended up developing better headgear, and they got the steel helmet, which protects the head from flying shrapnel falling projectiles ("10 Things").
This tool was used to dig trenches. It could be used to hastily dig a shallow hole when in need of protection, but it could also be helpful in hand-to-hand combat with its heavy head and sharp point. This tool was carried by all non-commissioned ranks in the British Army ("10 Things").
Postcard; mosquito net to be worn as veil by Wellcome Images licensed by Creative Commons Attribution 4.0 International
Many deaths were caused by disease, and most of these diseases traveled by insects. This net was issued to British soldiers to protect them from mosquitoes and other dangerous insects that carried diseases like malaria. This net protected the troops from flying insects getting to their skin ("10 Things").
Pocket Surgical Kit
Pocket Surgical Instrument Set, Cased, Barcelona, Spain, 180 Wellcome by Wellcome Images is licensed under Creative Commons Attribution 4.0 International
Most surgery happened outside of the lines of fighting, but basic emergency procedures could be done on the battlefield. This could save a life, or at least stop the injury from worsening until the person could get real medical attention. As the battlefield injuries got more gruesome, the tools and procedures developed rapidly ("10 Things").
"10 Things That Could Have Saved Your Life in the Trenches." Imperial WarMuseums, www.iwm.org.uk/history/10-things-that-could-have-saved-your-life-in-the-trenches. Accessed 24 Mar.2017.