According to Akira Fujiwara, Hirohito endorsed the policy of qualifying the invasion of China as an "incident" instead of a "war"; therefore, he did not issue any notice to observe international law in this conflict (unlike what his predecessors did in previous conflicts officially recognized by Japan as wars), and the Deputy Minister of the Japanese Army instructed the chief of staff of Japanese China Garrison Army on 5 August not to use the term "prisoners of war" for Chinese captives. This instruction led to the removal of the constraints of international law on the treatment of Chinese prisoners. The works of Yoshiaki Yoshimi and Seiya Matsuno show that the Emperor also authorized, by specific orders ("rinsanmei"), the use of chemical weapons against the Chinese. During the invasion of Wuhan, from August to October 1938, the Emperor authorized the use of toxic gas on 375 separate occasions, despite the resolution adopted by the League of Nations on 14 May condemning Japanese use of toxic gas.