https://www.farmanddairy.com/columns/barbed-wires-history-entangled-in-war/480937.html
https://en.wikipedia.org/wiki/History_of_chemical_warfare#World_War_II
https://www.kumc.edu/school-of-medicine/academics/departments/history-and-philosophy-of-medicine/archives/wwi/essays/medicine/gas-in-the-great-war.html
https://en.wikipedia.org/wiki/Tanks_in_World_War_I
https://blogs.loc.gov/inside_adams/2016/09/world-war-i-the-tech-of-the-tank/