Battle of the Marne (September
6-10, 1914)
Battle of Tannenberg (August
26-30,
1914)
Ottoman Empire enters war on
side of Central Powers (October 24, 1914)
The
Armenian Massacre (1915)
Battle of Gallipoli (February
1915--January
1916)
Sinking of Lusitania
(May
7, 1915)
Battle of Verdun (February
21-- July 1916)
Battle
of
the Somme (July 1--November 13, 1916)
February Revolution (1917): Tsar Nicholas abdicates and
the
Romanov dynasty ends; power passes to a provisional government.
United States declares war on Germany (April 1917)
Bolshevik Revolution (November 8,
1917)
Treaty of Brest-Litovsk (Feb.
1918)
Armistice Day (November 11, 1918)