Henry Jones Timeline By meihale Aug 4, 1914 The United Kingdom Joins The War Oct 19, 1914 Battle of Ypres Begins Apr 25, 1915 The Battle of Gallipoli Begins May 7, 1915 The British Ocean Liner RMS Lusitania is Sunk By German U-boat May 30, 1916 The Major Naval Battle of Jutland Begins Jul 1, 1916 The Battle of the Somme Begins Jan 19, 1917 Germany sends the Zimmerman Telegram then the British Intercept and Decipher the Coded Message Nov 11, 1918 World War 1 Ends