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.