13th May 1915
Western Front
Battle of Verdun: German attack north-east of Mort Homme repulsed.
Germans attack on British at Ploegsteert (north of Armentieres) repulsed.
Asiatic and Egyptian Theatres
Russians defeated at Ashkale (Armenia).
Aviation
Vosges: The "Escadrille Americaine", equipped with Nieuport fighter planes- worthy rivals of the Fokker planes flown by the Germans- makes its first patrol flight over the Western Front.
Naval
U.S. Navy threatens Santo Domingo, Dominican Republic with naval bombardment unless Desiderio Arias relinquishes power.
U.S. places six battleships—the Connecticut, Louisiana, New Jersey, Virginia, Rhode Island, and Nebraska—on reserve due to a lack of men.
Political, etc.
Clemens von Delbrük, German Minister of the Interior and Vice-Chancellor, resigns, as he was blamed for food riots.
Inventor Thomas Edison endorses former President Theodore Roosevelt for a third term as President.
U.S. War Department announces it is withdrawing U.S. troops in Mexico to Colonial Dublan, Mexico, located 100 miles from the border.
Ship Losses:
Eretria (United Kingdom) The cargo ship struck a mine and sank in the Bay of Biscay 15 nautical miles (28 km) south south west of the Île d'Yeu, Vendée, France.
