British war crimes September 1915 and continued their usage for the remainder of the war. This was done in retaliation for the use of chlorine by Imperial German Army the preceding April. Following the Imperial German Army's use of poison gas at Ypres, the commander of II Corps, Lieutenant General Sir Charles Ferguson, had said of poison gas: Mustard gas was first used effectively in World War I by the German army against British and Canadian soldiers near Ypres, Belgium, in 1917 and later also against the French Second Army. The name "Yperite" comes from its usage by the German army near the
Tanks in the German Army had the support of his commanders to develop his theories into reality. In 1931 the German General Staff accepted a plan for two types of tank, a medium tank with a 75 mm gun and a lighter vehicle with a 37 mm gun. While design and then construction work was carried out the German army used a variety of light tanks based on the British Carden-Lloyd chassis. The early tanks were code-named Landwirtschaftlicher Schlepper (La S), a designation that lasted until 1938. The first of these light tanks ran in early 1934, a five-ton Krupp design it was dubbed the