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Russia Mobilizes
Russia mobilizes its vast army to intervene against Austria-Hungary in favor of its ally, Serbia. This move starts a chain reaction that leads to the mobilization of the rest of the European Great Powers, and inevitably to the outbreak of hostilities. -
Germany invades Belgium
beginning World War I. -
Battle of the Marne
Battle of the Marne started -
First massive use of tanks
First use en masse of tanks at the Somme