On May 24, 1915, the Allied Powers jointly issued a statement explicitly charging for the first time ever another government of committing `a crime against humanity’.
The Allied Governments announce publicly that they will hold personally responsible all members of the Ottoman Government, as well as those of their agents who are implicated in the Armenian massacres.
Article 230 of the 1920 Treaty of Sèvres required the defeated Ottoman Empire to
…hand over to the Allied Powers the persons whose surrender may be required by the latter as being responsible for the massacres committed during the continuance of the state of war on territory which formed part of the Ottoman Empire on August 1, 1914.
Ottoman military and high-ranking politicians were transferred to the Crown Colony of Malta on board of the SS Princess Ena and the SS HMS Benbow by the British forces, starting in 1919. These war criminals were eventually returned to Constantinople in 1921 in exchange for 22 British hostages held by the government in Ankara.
But for victory at Gallipoli, the Anzacs would have been the first Sergeant at Arms of a war crimes trial. By marching into Constantinople, the Anzacs may have been able to prevent the purging of the Ottoman archives of evidence of complicity of specific individuals.