Following the reportage by Henry Morgenthau , Sr. , US Ambassador to the Ottoman Empire , of the Armenian resistance during the Armenian Genocide at the city of Van , the Triple Entente formally warned the Ottoman Empire on 24 May 1915 that : In the view of these ... crimes of Turkey against humanity and civilization ... the Allied governments announce publicly ... that they will hold personally responsible ... all members of the Ottoman Government and those of their agents who are implicated in such massacres . The initial prosecution of war criminals was established between 1919 and 1920 by the Turkish Committee of Union and Progress which charged and tried several former leaders and officials for subversion of the constitution , wartime profiteering , and the massacres of both Greeks and Armenians . At the same time the British Foreign Office conducted its own investigation into alleged war crimes , debating whether the process was adequately dealt with by Turkish courts martial
Armenians
Armenian Genocide
Prosecution of Ottoman war criminals