JUN 28, 1914

Jul 30, 1914 RUSSIA MOBILIZES

• Russia mobilizes its vast army to intervene against Austria-Hungary in favor of its ally, Serbia.

Aug 4, 1914 GERMANY INVADES

Apr 22, 1915 GERMANY FIRES

• The Germans fire shells filled with chlorine gas at Allied lines. This is the first time that large amounts of gas are used in battle, and the result is the near-collapse of the French lines. However, the Germans are unable to take advantage of the breach.

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THE U.S.