ww1 By caleb.baker Period: Aug 26, 1914 to Aug 30, 1914 Battle of Tannenberg Period: Sep 5, 1914 to Sep 12, 1914 First Battle of the Marne Mar 25, 1915 Battle of Gallipoli Period: Apr 22, 1915 to May 25, 1912 Second Battle of Ypres