From first shot to silence of peace

PARIS — As the world marks 100 years since the fighting stopped, here is a look at some key moments in the First World War. 1914 June 28: Serb teenager Gavrilo Princip kills Austrian Archduke Franz Ferdinand July 28: Austria-Hungary declares war on Serbia Aug. 1: Germany declares war on Russia Aug. 3: Germany declares war on France Aug. 4: Germany invades Belgium; Britain declares war on Germany Aug. 23: Japan declares war on Germany September: Battle of the Marne stops the German advance in France Oct. 29: Ottoman Empire enters the war November: Beginning of trench warfare Dec. 25: Unofficial Christmas Truce 1915 February: German U-boat campaign marks first large use of submarines in warfare April: Allied troops land in Gallipoli, Turkey, a defining moment for Australia, New Zealand April 22: First use of a chemical weapon, chlorine gas, near Ypres, Belgium May 7: British ship Lusitania sunk by German U-boat May 23: Italy enters war, against Austria-Hungary October: Bulgaria joins war, on side of Central Powers 1916 Feb. 21: Battle of Verdun begins March 9: Germany declares war on Portugal July 1: Battle of the Somme begins, with first mass use of tanks Aug. 27: Romania enters war, is invaded by Germany Sept. 4: British take Dar es Salaam in German East Africa October: Adolf Hitler wounded Dec. 23: Allied forces defeat Turkish in Sinai Peninsula 1917 March: Baghdad falls to AngloIndian forces April 6: U.S. declares war on Germany April: Battle for Vimy Ridge, defining moment for Canada July: Last Russian offensive ends in failure, as revolution nears; inconclusive Battle of Passchendaele in Belgium 1918 March 3: Treaty of Brest-Litovsk ends Russia’s involvement in the Eastern Front April 21: Legendary Red Baron killed June: Battle of Belleau Wood, defining moment for U.S. military July 21: German submarine fires on Cape Cod, only attack on mainland U.S. Oct. 30: Ottoman Empire signs armistice with Allies Oct. 31: Dissolution of AustroHungarian Empire Nov. 9: Germany’s Kaiser Wilhelm II abdicates Nov. 11: Germany signs armistice ending the war