31st May 1915
Western Front
Fighting at Hooge.
French take Souchez refinery and advance in the "Labyrinth" (north of Arras).
Zeppelin raid on London.
Eastern Front
Austro-Germans capture Stryj and the three northern fronts of Przemsyl.
Asiatic and Egyptian Theatres
British defeat Turks at Kurna (Tigris).
Naval and Overseas Operations
Germans capitulate to Anglo-French at Monso (Cameroons).
Italians attack Pola.
Political, etc.
British government prosecutes the London “Times” under the Defense of the Realm Act for reporting on military conditions in France.
Dissatisfaction in U.S.A. at German Note on the "Lusitania".
Riots in Ceylon.
Crowd of 30,000 people demonstrate in Bucharest, Romania in support of Italy’s entry into the war.
Ship Losses:
Montrosa ( Finland): The barque sank in the North Sea off the coast of Yorkshire, United Kingdom following an explosion. She probably struck a naval mine. Her fourteen crew were rescued by Brunia ( Sweden).
MERCHANT SHIPPING
British, Allied and Neutral ships lost to enemy submarines, mines and cruisers etc in the month - 71 ships of 121,000 tons gross (Lloyd's War Losses).
9 things you (probably) didn’t know about London’s first zeppelin raid in 1915
http://www.historyextra.com/article/...irst-world-war