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Here’s a further condensed version: *World War One - 1915* highlights German Zeppelin air raids on Britain, and the Royal Navy's victory at the Battle of Dogger Bank. Germany began unrestricted submarine warfare, while on the Eastern Front, Germany defeated Russia at Masurian Lakes, but Russia captured 100,000 Austro-Hungarians at Przemyśl. Allied ships faced heavy losses in the Dardanelles, and troops, including ANZACs, were pinned at Gallipoli. On the Western Front, British offensives failed, and Germany used chemical weapons at Ypres. The Armenian Genocide began in April. The sinking of *Lusitania* outraged the US, prompting Germany to suspend attacks on passenger ships. Italy joined the war, attacking Austria-Hungary, and Allied offensives in France resulted in heavy losses. In the Balkans, Serbia was overrun by the Central Powers, with the Serbian army suffering catastrophic losses during its retreat.