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First Battle of the Marne begins
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First Battle of the Masurian Lakes begins.
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Austro-German forces launch an attack into western Poland
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Tsar Nicholas takes commands of Russian armies
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British forces use gas in battle near Loos, but shifting winds cause 60,000 British casualties
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The Second Battle of Champagne begins
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Tanks introduced for the first time on the Somme battlefield by the British
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Russia's Brusilov offensive in Carpathia comes to an end, having nearly knocked Austria-Hungary out of the war.
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German troops break through the northernmost end of the Russian front during the Riga offensive
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Bulgaria concludes armistice negotiations with the Allies