1915
From top to bottom, left to right: The Sinking of the RMS Lusitania by a German U-boat kills nearly 1,200 people, including 128 Americans, heightening tensions between Germany and the United States; the Gallipoli campaign begins as Allied forces attempt an amphibious invasion of the Ottoman Empire, ending in failure; the Armenian genocide starts with the arrest, deportation, and mass extermination of up to 1.5 million Armenians; the Gorlice–Tarnów offensive breaks Russian lines in Galicia, shifting the Eastern Front in favor of the Central Powers; the Second Battle of Ypres marks the first large-scale use of poison gas on the Western Front; and Italy joins the Allies, opening the Italian Front against Austria-Hungary.
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1915 (MCMXV) was a common year starting on Friday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1915th year of the Common Era (CE) and Anno Domini (AD) designations, the 915th year of the 2nd millennium, the 15th year of the 20th century, and the 6th year of the 1910s decade. As of the start of 1915, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.