23 April

1915 (Friday)

 * Second Battle of Ypres: German attack east and west of St. Julien repulsed by Canadians; Germans take several hamlets.
 * Turkish coast bombarded by Allied fleet in the Gulf of Saros.
 * British Government declares a blockade of the Cameroons (see 29 February 1916).
 * White Book on military operations in Togoland published.
 * Sir Edward Grey presides over a conference of the French, Russian, Italian and Serbian ministers.
 * Battle of Gravenstafel Ridge begins (Ypres).