Armenia is a country sandwiched between Turkey(ottoman empire) and Russia. Both had Armenians in their military troops which turned out to be oil in the burning fire.
Turks turned dictators:
Although Ottoman empire was predominantly a Muslim country, there were also Christians who comprised 45% of the total population. Ottoman military started to deport Armenians from the war zone fearing they might join in the Russian army. But they explained to Allies the deportation was a precautionary measure.
1915 was a victorious year for the Central powers. But there were some wars which made them to taste the failure as well.
In January 1915, Russians routed Ottoman troops at the Battle of Sarakimis in which Ottoman army lost more than half of its soldiers.
Armenians in the Ottoman army fought loyally and bravely but the Turks blamed the defeat was because of the Armenian traitors in army.
Ottoman commanders disarmed their own Armenian soldiers and imprisoned on terms of suspicion that they were potential traitors.
It did not end there! From 1915-1916, Turks involved in the mass killing and genocide of Armenian Christian people living in the Ottoman empire who they considered disloyal.
Out of 1.5 million Armenian, 1.2 million were died during genocide from massacres, individual killings, ill treatment, exposure, and starvation. Many died during deportation while crossing desert regions.
Tens of thousands of orphans found refuge in the protection of foreign missionaries.
However, Turks denied there was no genocide happened and the deaths were a part of war loss. Although there were several postwar trials, no Ottoman perpetrators were held accountable for these crimes.