According to Yoshimi and Seiya Matsuno, Emperor Hirohito signed orders specifying the use of chemical weapons in China. For example, during the Battle of Wuhan from August to October 1938, the Emperor authorized the use of toxic gas on 375 separate occasions, despite the 1899 Hague Declaration "IV, 2 – Declaration on the Use of Projectiles the Object of Which is the Diffusion of Asphyxiating or Deleterious Gases" and Article 23 (a) of the 1907 Hague Convention "IV – The Laws and Customs of War on Land". A resolution adopted by the League of Nations on 14 May condemned the use of poison gas by Japan.