Use of chemical and biological weapons Despite Article 23 of the Hague Conventions of 1899 and 1907, article V of the Treaty in Relation to the Use of Submarines and Noxious Gases in Warfare, article 171 of the Treaty of Versailles and a resolution adopted by the League of Nations on 14 May 1938, condemning the use of poison gas by the Empire of Japan, the Imperial Japanese Army frequently used chemical weapons during the war.
Use of chemical and biological weapons Despite Article 23 of the Hague Conventions of 1899 and 1907 article V of the Treaty in Relation to the Use of Submarines and Noxious Gases in Warfare article 171 of the Treaty of Versailles and a resolution adopted by the League of Nations on 14 May 1938 condemning the use of poison gas by the Empire of Japan the Imperial Japanese Army frequently used chemical weapons during the war