The carnage and crucible of WW1 didn’t end in 1918, but the gruesome genocide continued. The Greeks and Turks fought for centuries before then, and have continued since. No wonder.
World War I had been a catastrophe for the Ottoman Empire. Siding with the Central Powers, including Germany, Austria-Hungary, and Bulgaria, Sultan Mehmed V Rashād (The True Path Follower) fought the Serbians, Rumanians, Russians, British, French, Arabs, and others. The Turks enjoyed some early successes, notably at Gallipoli (1915) and Kut (1916). Such victories emboldened radicals in the government to attack their traditional enemies, the Armenians, and in this genocide 1.5 million Armenian Christians perished. The tide of war turned against the Ottomans, as it did against all of the Central Powers, and ultimately the strategically encircled Turks lost their empire and their political system. An estimated 5 million Turks died, the sultanate ceased to exist, and Mustafa Kemal, later known as the Father of the Turks (Ataturk), rose to prominence.