Paris Green
In the late 1930s the Chamberlain Government planned that the United Kingdom should be in a position at the beginning of any war to retaliate in kind if the Germans, as expected, used mustard gas and phosgene. to help repel a German invasion in 1940–1941, and had there been an invasion may have also deployed it against German cities. General Brooke, in command of British anti-invasion preparations of World War II said that he "...had every intention of using sprayed mustard gas on the beaches" in an annotation in his diary. The British manufactured mustard, chlorine, lewisite, phosgene and Paris Green and stored it at airfields and depots for use on the beaches.