April 22nd, 1915
The use of poison gas in World War I escalates when chlorine gas is released as a chemical weapon in the Second Battle of Ypres. event on April 22, 1915. Read about how to open files in Open File Database.
Events around April 22, 1915
| April 24th, 1915 | Event | The Armenian Genocide begins with a massacre of hundreds of prominent Armenians in Constantinople (now Istanbul). |
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