15th June 1916
Western Front
Battle of Verdun: French take a trench on Mort Homme and repulse heavy counter-attacks at Caillette Wood.
Eastern Front
Russians advance north-west of Czernowitz; heavy fighting in the centre.
Southern Front
Artillery activity at Salonika.
Austrians repulsed on Asiago plateau; successful Italian counter-attack.
Asiatic and Egyptian Theatres
British cavalry raid an Arab tribe (Mesopotamia).
Heavy fighting at Saripul (Persia).
Naval and Overseas Operations
British secure bridge at Korogwe (west of Tanga, German East Africa), and occupy an island in Lake Victoria.
Sea War
Royal Navy first operates shore-controlled minefields (hydrophone and magnetophone) mainly in Flanders and Shetlands (sink 2 U-boats; 2 possible, 2 damaged). Paravanes begun to be fitted to merchant ships (code name Otto), 274 by end of hostilities.
Air War
Arabia: 3 seaplanes from HMS Ben-My-Chree bomb Turks at Jeddah.
The first Boeing-built airplane made its maiden flight.
Political, etc.
British and French officials hint that an Allied offensive is imminent on the Western Front.
British Chamber of Commerce passes a resolution requesting all members of German or Austrian birth, even if naturalized, to resign.
Daylight Saving Act comes into operation.
Ship Losses:
Adelina (Italy) The sailing vessel was sunk in the Pionbino Channel (43°00′N 10°05′E) by
SM U-35 ( Kaiserliche Marine).
Annetta (Italy) The sailing vessel was sunk in the Ligurian Sea (43°10′N 10°05′E) by
SM U-35 ( Kaiserliche Marine). Her crew survived.
Audace (Italy) The sailing vessel was sunk in the Mediterranean Sea 30 nautical miles (56 km) off Cape Corse, Corsica, France (43°30′N 9°15′E) by
SM U-35 ( Kaiserliche Marine).
Sardinia (United Kingdom) The cargo ship was shelled and sunk in the Mediterranean Sea 38 nautical miles (70 km) west of Gorgona, Italy (43°30′N 8°50′E) by
SM U-35 ( Kaiserliche Marine). Her crew survived.
S. Maria (Italy) The barque was sunk in the Mediterranean Sea 10 nautical miles (19 km) north of Cape Corse by
SM U-35 ( Kaiserliche Marine).