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Germany declares war on France and Belgium.[7]
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The Russian army enters East Prussia. Battle of Stalluponen.
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The Germans attack the Russians in East Prussia. The attack is a failure in addition to being a deviation from the Schlieffen Plan.[13]
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Battle of Gorlice-Tarnów: the German troops under General Mackensen break through the Russian lines in Galicia.
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Battle of Erzurum.
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Battle of Rafa. The British drive the Ottomans out of Sinai.
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Battle of Vittorio Veneto. The Austro-Hungarian army is routed. The Italians enter Trent and land at Triest.
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Treaty of Versailles between the Allies and Germany: the Peace Conference opens in Paris
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Treaty of Kars between Bolshevik Russia and Turkey.
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Treaty of Rome between Italy and Yugoslavia. Fiume is annexed by Italy and the neighboring town of Sušak is assigned to Yugoslavia.