Tags: Weapon.
Blue Cross (Blaukreuz) is a World War I chemical warfare agent consisting of diphenylchloroarsine (DA Clark I) diphenylcyanoarsine (CDA Clark II) ethyldichloroarsine (Dick) and/or methyldichloroarsine (Methyldick). Clark I and Clark II were the main agents used.Clark I was used with Green Cross munition earlier; however for the first time it was used as a standalone agent in the night from July 10 to July 11 1917 at Nieuwpoort Belgium during the operation Strandfest.