9 May

1915 (Sunday)

 * Second Battle of Ypres: British retake Wieltje. They fail in an attack on Aubers Ridge (Neuve Chapelle).
 * Allied Spring Offensive begins.
 * Second Battle of Artois begins (see 18 June).
 * The leading division of the British New Armies leaves England for France (see 21 August 1914 and 24 February 1915).
 * Germans defeated at Krakinow (Baltic Provinces).
 * President Wilson, in a speech, defines United States policy in regard to the RMS Lusitania outrage (see 7 May).
 * Chinese Government yield to Japanese demands (see 7 and 25 May).