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Battle of Tannenberg, which Russia loses; Germany's greatest success of the war on Eastern Front
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First Battle of Marne, halts German advance, resulting in stalemate and trench warfare
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First Battle of Masurian Lakes, which Russia loses
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The "race to the sea", trenches appear on September 15
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Austro-Hungarian attack on Russian Poland (Galicia) collapses, with the Russians counterattacking
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Russians suffer heavy losses at Second Battle of Masurian Lakes (also known as the Winter Battle)
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Allied amphibious attack on the Dardanelles and Gallipoli (initiated by Winston Churchill, who resigns as a consequence) ends with the Turkish siege of the Allied forces
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U-boat sinks British liner Lusitania with the loss of American lives, creating a US-German diplomatic crisis
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Italians launch unsuccessful attack on Hungarians at 1st, 2nd, 3rd & 4th Battles of Isonzo; there are to be 12 in total
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German attack on Verdun in the longest battle of the war, ultimately defended by the French at great cost to both sides
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Battle of Jutland, the biggest naval battle in history, ultimately without a clear victor
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