23rd April 1917
Western Front
British capture rest of Trescault and greater part of Havrincourt Wood - Second phase of Battle of Arras begins.
British attack north and south of the Scarpe (Arras), capturing two villages.
Asiatic and Egyptian Theatres
British occupy Samarra (60 miles north of Baghdad), 937 prisoners.
Naval and Overseas Operations
Between Blankenberghe and Zeebrugge three British seaplanes attack five German destroyers and sink one.
Political, etc.
French government threatens to put German prisoners on board hospital ships if U-boats continue attacking those ships.
Diplomatic relations broken off between U.S.A. and Turkey (no state of war followed).
Ship Losses:
Acadian (Norway) The barque was scuttled in the Atlantic Ocean 65 nautical miles (120 km) north west of Tory Island, County Donegal, United Kingdom (55°44′N 9°30′W) by SM U-52 ( Kaiserliche Marine). Her crew survived.
Auriac (United Kingdom) The coaster was shelled and sunk in the North Sea 5 nautical miles (9.3 km) east south east of St Abb's Head, Berwickshire by SM UC-44 ( Kaiserliche Marine) with the loss of a crew member.
Bandiera E. Moro (United Kingdom) The cargo ship was sunk in the Atlantic Ocean 50 nautical miles (93 km) west of Tangier, Morocco by SM U-35 ( Kaiserliche Marine). Her crew survived.
Baron Stjernblad (Denmark) The coaster was sunk in the North Sea 5 nautical miles (9.3 km) north east of Eyemouth, Berwickshire by SM UC-44 ( Kaiserliche Marine). Her crew survived.
Boro (Italy) The sailing vessel was sunk in the Aegean Sea east of Rhodes, Greece by SM UB-42 ( Kaiserliche Marine).
Calluna (Denmark) The barque was sunk in the Atlantic Ocean south west of the Isles of Scilly, United Kingdom (48°51′N 8°38′W) by SM U-61 ( Kaiserliche Marine). Her crew survived.
Cenobic (Belgium) The fishing vessel struck a mine laid by UC 71 (Hans Valentiner) and sank in the English Channel off Le Tréport, Seine-Maritime, France with the loss of four of her crew.
Dykland (United Kingdom) The cargo ship was torpedoed and sunk in the Atlantic Ocean 200 nautical miles (370 km) west north west of the Fastnet Rock by SM U-50 ( Kaiserliche Marine). Her crew survived.
Eptapyrgion (United Kingdom) The cargo ship was torpedoed and sunk in the Atlantic Ocean 150 nautical miles (280 km) west of the Isles of Scilly by SM U-53 ( Kaiserliche Marine). Her crew survived.
Imataka (United Kingdom) The cargo ship was torpedoed and sunk in the Irish Sea 15 nautical miles (28 km) south south west of the Daunt Rock by SM UC-47 ( Kaiserliche Marine). Her crew survived.
Lena (United Kingdom) The cargo ship was sunk in the Atlantic Ocean south west of the Isles of Scilly (48°45′N 8°30′W) by SM U-61 ( Kaiserliche Marine) with the loss of all 25 crew.
HMT Lena Melling (Royal Navy) The naval trawler struck a mine and sank in the North Sea off the Elbow Lightship ( United Kingdom) (51°22′30″N 1°33′30″E) with the loss of eleven of her crew.
Marita (Norway) The full-rigged ship was sunk in the Atlantic Ocean 110 nautical miles (200 km) west of St. Kilda, Inverness-shire, United Kingdom (58°21′N 10°34′W) by SM U-82 ( Kaiserliche Marine). Her crew survived.
Oswald (United Kingdom) The cargo ship was torpedoed and sunk in the Atlantic Ocean 200 nautical miles (370 km) south west of the Fastnet Rock by SM U-50 ( Kaiserliche Marine). Her crew survived.
HMT Rose II (Royal Navy) The naval trawler struck a mine laid by UC 66 (Herbert Pustkuchen) and sank in the Irish Sea off Belfast, County Down (54°44′N 5°38′W) with the loss of six of her crew.
Savio (Italy) The cargo ship was sunk in the Bay of Biscay 20 nautical miles (37 km) south east of Belle Île, Morbihan, France by SM UC-36 ( Kaiserliche Marine). Her crew survived.
Scot (Denmark) The cargo ship was sunk in the North Sea 12 nautical miles (22 km) east by north of St Abb's Head (56°02′N 1°46′W) by SM UC-44 ( Kaiserliche Marine). Her crew survived.
Stegg (Norway) The coaster was sunk in the North Sea (60 nautical miles (110 km) east of Lerwick, Shetland Islands, United Kingdom (60°41′N 0°37′E) by SM UC-41 ( Kaiserliche Marine) with the loss of a crew member.
Svanen (Denmark) The full-rigged ship was sunk in the Atlantic Ocean 30 nautical miles (56 km) west north west of Muckle Flugga, Shetland Islands by SM U-60 ( Kaiserliche Marine) with the loss of two crew.
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