World War I was considered a modern war.  The use of trench warfare and poison gas and the introduction of new weapons like machine guns, flame throwers, tanks, and submarines greatly impacted the conflict.

Technology in the war reflected the world’s trend toward industrialism and the application of mass production methods.  The production and use of new technology and fighting methods were made possible, in part, by the iron and steel industry.

Iron and steel companies were responsible for the manufacture of many items that soldiers used during the war: shoes, helmets, weapons, ammunition, tanks, ships, and more.  The use of iron and steel helped define World War I.