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6/28/1914
The Assassination of Archduke Franz Ferdinand Had Happened This Day Which Started A Domino Effect -
7/28/1914
The government of Austria-Hungary declared war on Serbia -
8/4/1914
Great Britain declared war on Germany at 11:00 p.m -
5/7/1915
The British ocean liner Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland. Within 20 minutes, the vessel sank into the Celtic Sea. Of 1,959 passengers and crew, 1,198 people were drowned, including 128 Americans. -
11/7/1915
The first German Zeppelin raid on England, the Gallipoli Campaign and the Battle of Loos. The first German Zeppelin raid on the east coast of England; Great Yarmouth and King's Lynn are both bombed -
1/19/1917
The British intercept a telegram sent by Alfred Zimmermann in the German Foreign Office to the German embassies in Washington, D.C., and Mexico City. Its message outlines plans for an alliance between Germany and Mexico against the United States -
4/6/1917
The United States formally declared war against Germany and entered the conflict in Europe -
6/25/1917
The battle began with the detonation of 19 mines beneath the German front position, which devastated it and left 19 large craters.
Battle of Messines (1917 -
11/11/1918
After more than four years of horrific fighting and the loss of millions of lives, the guns on the Western Front fell silent. Although fighting continued elsewhere, the armistice between Germany and the Allies was the first step to ending World War I -
6/28/1919
Germany and the Allies signed the Treaty of Versailles, formally ending World War I and providing for the creation of the League of Nations