Chemical weapons in World War I volatile oily liquid. It was introduced as a vesicant by Germany in July 1917 prior to the Third Battle of Ypres. The Germans marked their shells yellow for mustard gas and green for chlorine and phosgene; hence they called the new gas "Yellow Cross". It was known to the British as "HS" ("Hun Stuff"), and the French called it "Yperite" (named after Ypres). Mustard gas is not an effective killing agent (though in high enough doses it is fatal) but can be used to harass and disable the enemy and pollute the battlefield. Delivered in artillery shells, mustard gas was
Tanks in the German Army was enough equipment for about 40 army divisions. The Germans integrated the Czech industry, mainly the Skoda factories, becoming part of the German military production machine and continued to produce tanks and other weapons for Germany. So when Germany invaded France, three full German Panzer divisions were equipped with Czech tanks. One division was equipped with the Czech type 35 light tank (10 tons) renamed Panzer 35, and two divisions were equipped with the type 38 light tank (10 tons) renamed Panzer 38. The Panzer 35 had a crew of four and carried a Czech 37mm gun (with 72 rounds)