On This Day - 23 April 1915
Theatre definitions: Western Front comprises the Franco-German-Belgian front and any military action in Great Britain, Switzerland, Scandinavia and Holland. Eastern Front comprises the German-Russian, Austro-Russian and Austro-Romanian fronts. Southern Front comprises the Austro-Italian and Balkan (including Bulgaro-Romanian) fronts, and Dardanelles. Asiatic and Egyptian Theatres comprises Egypt, Tripoli, the Sudan, Asia Minor (including Transcaucasia), Arabia, Mesopotamia, Syria, Persia, Afghanistan, Turkestan, China, India, etc. Naval and Overseas Operations comprises operations on the seas (except where carried out in combination with troops on land) and in Colonial and Overseas theatres, America, etc. Political, etc. comprises political and internal events in all countries, including Notes, speeches, diplomatic, financial, economic and domestic matters. Source: Chronology of the War (1914-18, London; copyright expired)
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.
Naval and Overseas Operations
British Government declares a blockade of the Cameroons.
White Book on military operations in Togoland published.
Sir Edward Grey presides over a conference of the French, Russian, Italian and Serbian ministers.