Question: what important events happened in world war 1?
Answer: June 28, 1914. Archduke Francis Ferdinand is assassinated. July 28, 1914. Austria-Hungary declares war on Serbia, beginning World War I. August 2-7, 1914. Germany invades Luxembourg and Belgium. ...  August 10, 1914. Austria-Hungary invades Russia. September 9, 1914. ...  February 18, 1915. ...  April 25, 1915. ...  May 7, 1915.