Helmets are used to protect the head area. They can prevent fatal head injuries, and can save lives
During the War many soldiers needed portective gear from flying bullets. They made a Steel Helmet:"The steel helmet was invented and fielded in response to increased lethality on the battlefield due to advances in artillery and fragmentation. World War I witnessed the first wide-spread use of the steel helmet, which remains a signature piece of equipment in modern warfare."
https://encyclopedia.1914-1918-online.net/article/steel_helmet
During the War many soldiers needed portective gear from flying bullets. They made a Steel Helmet:"The steel helmet was invented and fielded in response to increased lethality on the battlefield due to advances in artillery and fragmentation. World War I witnessed the first wide-spread use of the steel helmet, which remains a signature piece of equipment in modern warfare."
https://encyclopedia.1914-1918-online.net/article/steel_helmet