12th April 1917
Western Front
British advance north of Vimy Ridge, taking the "Pimple" and Bois en Hache, and south of Arras-Cambrai road take Heninel and Wancourt.
Asiatic and Egyptian Theatres
Turks retreat towards Deli Abbas (between Tigris and Diala).
Naval
Greek ship “India” being sunk by the German U-Boat U-35.
Political, etc.
London meetings celebrating entry of U.S.A. into war.
Mexico reassures it will continue the exportation of oil to Britain after diplomatic pressure from Britain and the U.S.
Costa Rica places territorial waters and ports at disposal of U.S.A.
Ship Losses:
Angela M. (Italy) The three-masted schooner was scuttled in the Mediterranean Sea north west of Cape Bougaroni, Algeria by
SM U-65 ( Kaiserliche Marine).
Caliban (United Kingdom) The trawler was shelled and sunk in the North Sea 45 nautical miles (83 km) north east by east of Rattray Head, Aberdeenshire by
SM UC-76 ( Kaiserliche Marine). Her crew survived.
Chinkiang (United Kingdom) The trawler was shelled and sunk in the North Sea 30 nautical miles (56 km) north east by east of Buchan Ness, Aberdeenshire by
SM UC-76 ( Kaiserliche Marine). Her crew survived.
Crown Prince (United Kingdom) The trawler was shelled and sunk in the North Sea 45 nautical miles (83 km) north east by east of Girdle Ness by
SM UC-76 ( Kaiserliche Marine). Her crew survived.
Dina Henderika (Netherlands) The sailing vessel was scuttled in the North Sea 30 nautical miles (56 km) east north east of Hartlepool, County Durham, United Kingdom by
SM UC-30 ( Kaiserliche Marine).
Edelweiss (France) The sailing vessel was shelled and sunk in the English Channel off Cherbourg, Seine-Maritime by
SM UC-71 ( Kaiserliche Marine).
Equerry (United Kingdom) The trawler was shelled and sunk in the North Sea 35 nautical miles (65 km) north east of Kincaid Head by
SM UC-76 ( Kaiserliche Marine). Her crew survived.
Ernst Sophie (Russia) The sailing vessel was scuttled in the Atlantic Ocean south west of Ireland (51°05′N 11°58′W) by
SM UC-27 ( Kaiserliche Marine).
Fife Ness (United Kingdom) The fishing vessel was shelled and sunk in the North Sea 23 nautical miles (43 km) east north east of Fraserburgh, Aberdeenshire by
SM UC-76 ( Kaiserliche Marine). Her crew survived.
Glencliffe (United Kingdom) The cargo ship was torpedoed and sunk in the Mediterranean Sea 2.5 nautical miles (4.6 km) off Tabarka Island, Alicante, Spain (38°07′N 0°22′W) by
SM U-52 ( Kaiserliche Marine) with the loss of a crew member. Three survivors were taken as prisoners of war.
India (Greece) The cargo ship was sunk in the Mediterranean Sea east of Gibraltar by
SM U-35 ( Kaiserliche Marine).
Kildale (United Kingdom) The cargo ship was torpedoed and sunk in the Mediterranean Sea 40 nautical miles (74 km) east of Pantelleria, Italy (36°44′N 12°32′E)
SM U-32 ( Kaiserliche Marine) with the loss of a crew member.
Kolaastind (Norway) The cargo ship was sunk in the North Sea (60°14′N 2°42′E) by
SM U-30 ( Kaiserliche Marine) with the loss of four crew.
Largo Bay (United Kingdom) The trawler was shelled and sunk in the North Sea 30 nautical miles (56 km) north east by east of Buchan Ness by
SM UC-76 ( Kaiserliche Marine). Her crew survived.
Lilian (United Kingdom) The trawler was shelled and sunk in the North Sea 45 nautical miles (83 km) north east by east of Girdle Ness by
SM UC-76 ( Kaiserliche Marine). Her crew survived.
Lismore (United Kingdom) The passenger ship was torpedoed and sunk in the English Channel 22 nautical miles (41 km) north west by north of Le Havre, Seine-Maritime, France (49°48′N 0°18′W) by
SM UB-38 ( Kaiserliche Marine) with the loss of five lives.
Neptunus (Netherlands) The sailing vessel was sunk in the North Sea 20 nautical miles (37 km) east north east of Hartlepool by
SM UC-30 ( Kaiserliche Marine).
Niritos (Greece) The cargo ship was sunk in the Mediterranean Sea 5 nautical miles (9.3 km) off Augusta, Sicily, Italy (37°13′N 15°20′E) by
SM U-27 ( Austro-Hungarian Navy).
Osprey (United Kingdom) The trawler was shelled and sunk in the North Sea 45 nautical miles (83 km) north east by east of Girdle Ness by
SM UC-76 ( Kaiserliche Marine). Her crew survived.
Toro (United Kingdom) The cargo ship was torpedoed and sunk in the Atlantic Ocean 200 nautical miles (370 km) west north west of Ouessant, Finistère, France (48°30′N 10°00′W) by
SM U-55 ( Kaiserliche Marine) with the loss of fourteen crew. Two survivors were taken as prisoners of war.
Union (Denmark) The schooner was sunk in the North Sea 18 to 20 nautical miles (33 to 37 km) east of the Souter Lighthouse, County Durham by
SM UC-30 ( Kaiserliche Marine). Her crew survived.
Voorwarts (Netherlands) The schooner was sunk in the North Sea 20 nautical miles (37 km) east north east of Hartlepool by
SM UC-30 ( Kaiserliche Marine).