The Ottoman Empire, considering its resident Christian Armenians sympathetic to traditional Turkish enemy Russia, deport them en masse from Anatolia in the “first genocide of modern times”.
In the massacres and hardships that ensue, between 600,000 and one million Armenians die.
Einstein, after a number of faslse starts, publshes the general theory of relativity in late 1915.
He numbers among a very few German professors who remain pacifists and do not support Germany’s war aims.
German forces employ chlorine gas on the battlefield against French and Algerian troops in 1915.
The Germans uses a form of tear gas, T-Stoff, on the Russian front.
The Russians, in 1915, apprehend German spies reportedly attemting to spread plague bacteria.