30th June 1917
Western Front
British capture further enemy defences south-west and west of Lens.
German attack on Chemin des Dames.
Violent artillery action west of Mort Homme (Verdun).
Eastern Front
Heavy artillery action in Galicia.
Naval and Overseas Operations
HMS Cheerful, a British destroyer, hits a German mine off the Shetland Islands and sinks, resulting in 40 deaths.
German forces driven from Nyassaland to the Rovuma border by British and Portuguese.
Political, etc.
Greece breaks off relations with Germany and Austria-Hungary.
Soviet delegates leave Russia for Socialist conferences in Stockholm, England, France and Italy.
Neutral Spain bans all submarines of belligerent powers from entering Spanish waters.
Ship Losses:
Alkelda (Italy) The yacht was sunk in the Ligurian Sea by SM U-63 ( Kaiserliche Marine).
Asalia (Norway) The four-masted barque was damaged in the Western Approaches (51°00′N 13°50′W) by SM UC-44 ( Kaiserliche Marine). She sank the next day; her crew survived.
Benguela (Norway) The cargo ship, which had been captured on 14 June, was sunk in the Atlantic Ocean off Punta Delgada, Canary Islands, Spain (40°22′N 26°05′W) by SM U-155 ( Kaiserliche Marine).
Borgund I (Norway) The coaster was sunk in the English Channel off Dartmouth, Devon, United Kingdom (50°33′N 2°33′W) by SM UB-40 ( Kaiserliche Marine). Her crew survived.
Bröderna (Sweden) The fishing vessel was sunk in the North Sea north east of the Shetland Islands, United Kingdom by SM U-79 ( Kaiserliche Marine).
Caledonien (France) The passenger ship struck a mine laid by
UC 34 (Robert Sprenger) and sank in the Mediterranean Sea 30 nautical miles (56 km) north of Port Said, Egypt (31°45′N 32°23′E).
Château Yquem (France) The cargo ship was sunk in the English Channel 22 nautical miles (41 km) west of Portland Bill, Dorset, United Kingdom by SM UB-40 ( Kaiserliche Marine).
HMS Cheerful (Royal Navy) The Mermaid-class destroyer struck a mine laid by UC 33 (Martin Schelle) and sank in the Atlantic Ocean off the Shetland Islands (60°02′N 1°07′W) with the loss of 40 of her 62 crew.
Concettina (Italy) The sailing vessel was sunk in the Mediterranean Sea east of Sicily by SM UB-47 ( Kaiserliche Marine).
Enrichetta (Italy) The cargo ship was torpedoed and sunk in the Gulf of Genoa (44°12′N 9°23′E) by SM U-63 ( Kaiserliche Marine) with the loss of a crew member.
Flying Falcon (United Kingdom) The tug was driven ashore in Machrie Bay, Islay and was abandoned. She was salvaged in 1919, repaired and returned to service.
Germania (Sweden) The cargo ship was torpedoed and sunk in the North Sea whilst in convoy, 40 nautical miles (74 km) east of the Orkney Islands, United Kingdom[400] (59°00′N 1°10′W) by SM UC-33 ( Kaiserliche Marine). Her crew survived.
Haigh Hall (United Kingdom) The cargo ship was torpedoed and sunk in the Mediterranean Sea 40 nautical miles (74 km) east of Malta (36°12′N 15°24′E) by SM U-28 ( Austro-Hungarian Navy). Her crew survived.
Il Nuovo Gasperino Gabriele (Italy) The sailing vessel was sunk in the Mediterranean Sea south west of Marsala, Sicily by SM UC-67 ( Kaiserliche Marine).
Ilston (United Kingdom) The cargo ship was torpedoed and sunk in the English Channel 4 nautical miles (7.4 km) south east of The Lizard, Cornwall (49°56′N 5°07′W) by SM UB-23 ( Kaiserliche Marine) with the loss of six of her crew.
Lady of the Lake (United Kingdom) The ketch was scuttled in the Atlantic Ocean 25 nautical miles (46 km) south east by east of Mine Head, County Cork by SM UC-30 ( Kaiserliche Marine). Her crew survived.
Lancaster (Sweden) The fishing vessel was sunk in the North Sea north east of the Shetland Islands by SM U-79 ( Kaiserliche Marine).
Leytenant Zatsarenni (Imperial Russian Navy) The destroyer struck a mine and sank in the Black Sea off the mouth of the Danube.
Markersdal (Denmark) The cargo ship was sunk in the North Sea 12 nautical miles (22 km) south of Flamborough Head, Yorkshire, United Kingdom by SM UC-63 ( Kaiserliche Marine). Her crew survived.
Mont Viso (France) The troopship was sunk in the Mediterranean Sea off Gourraya, Algeria (36°39′N 1°55′E) by SM U-34 ( Kaiserliche Marine).
Phoebus (Italy) The cargo ship was torpedoed and sunk in the Irish Sea off Castletown, Isle of Man by SM UC-44 ( Kaiserliche Marine). Her crew survived.
Preceptor (Sweden) The fishing vessel was sunk in the North Sea north east of the Shetland Islands (61°42′N 1°17′E) by SM U-79 ( Kaiserliche Marine).
Sacra Famiglia (Italy) The sailing vessel was sunk in the Mediterranean Sea east of Sicily by SM UB-47 ( Kaiserliche Marine).
Siraa (Norway) The full-rigged ship was sunk in the Atlantic Ocean off Punta Delgada, Canary Islands (40°22′N 26°51′W) by SM U-155 ( Kaiserliche Marine). Her crew survived.
MERCHANT SHIPPING
British, Allied and Neutral ships lost to enemy submarines, mines and cruisers etc in the month - 352 ships of 708,000 tons gross. (Lloyd's War Losses).
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