WWI By jcooper16 Jun 28, 1914 Archduke Franz Ferdinand is assassinated in Sarajevo Jul 28, 1914 Austria-Hungary declares war on Serbia Jul 30, 1914 Russia mobilizes its army to intervene in the conflict involving its ally, Serbia Aug 4, 1914 Germany invades Belgium, beginning World War I Apr 22, 1915 Germany uses chlorine gas filled shells on Allied lines May 7, 1915 Lusitania sinks Sep 18, 1915 Germany limits its submarine use Sep 15, 1916 Britain deploys the first tank Feb 1, 1917 Germany resumes unrestricted submarine warfare Feb 25, 1917 British intelligence intercepts the Zimmerman Telegram Apr 2, 1917 President Wilson outlines his case for war to Congress Apr 6, 1917 The U.S. enters World War I on France and Britain's side May 18, 1917 Selective Service Act allows a draft to be carried out Mar 3, 1918 Germany and Russia make peace May 28, 1918 The Battle of Cantigny is the first American offensive of the war Jun 3, 1918 The Americans attack the Germans at Chateau-Thierry Jun 6, 1918 Battle of Belleau Wood Jun 26, 1918 Belleau Wood ends Nov 9, 1918 Kaiser Wilhelm abdicates Nov 11, 1918 Armistice Day
