21st May 1917
Western Front
British capture "Siegfried" line from Bullecourt to one mile east of Arras (bar 2,000 yards).
French claim great success on Moronvilliers ridge and ground held.
Activity on California Plateau and near Craonne.
Southern Front
Severe fighting in the Travignolo Valley (Trentino); enemy penetrate and are later ejected.
Naval
German submarine
UC-36, which sunk 22 merchant ships and 2 warships, is rammed and sunk by a French steamer.
Political, etc.
U.S.A. Division to start at once for France under General Pershing.
M. Albert Thomas, French Minister of Munitions, speaks with effect in Moscow.
Premier Lloyd George proposes in Parliament a constitutional convention for Ireland to decide its fate.
Berlin residents are warned that the government may not be able to fulfill potato rations. Pork will only be sold on Thursday.
Ship Losses:
HMS Ampleforth (Royal Navy) The collier was torpedoed and sunk in the Mediterranean Sea 15 nautical miles (28 km) west south west of Gozo, Malta (36°10′N 13°30′E) by
SM U-65 ( Kaiserliche Marine) with the loss of four of her crew.
City of Corinth (United Kingdom) The cargo ship was torpedoed and sunk in the English Channel 12 nautical miles (22 km) south west of The Lizard, Cornwall (49°54′N 5°30′W) by
SM UB-31 ( Kaiserliche Marine). Her crew survived.
Don Diego (United Kingdom) The cargo ship was shelled and sunk in the Mediterranean Sea 40 nautical miles (74 km) east by south of Linosa, Italy (35°50′N 13°40′E) by
SM U-65 ( Kaiserliche Marine) with the loss of five of her crew.
Ferdinand A. (France) The cargo ship was torpedoed and sunk in the Bay of Biscay 10 to 15 nautical miles (19 to 28 km) off the Stiff Lighthouse, Ouessant, Finistère (48°40′N 5°10′W) by
SM UC-36 ( Kaiserliche Marine). Her crew survived.
Jupiter (United Kingdom) The cargo ship was torpedoed and sunk in the English Channel 15 nautical miles (28 km) west of Beachy Head, East Sussex (50°38′N 0°05′W) by
SM UB-40 ( Kaiserliche Marine) with the loss of nineteen of her crew.
Lanthorn (United Kingdom) The cargo ship was captured and scuttled in the North Sea off Whitby, Yorkshire by
SM UB-41 ( Kaiserliche Marine). Her crew survived.
Lynton (Russia) The four-masted barque was sunk in the Atlantic Ocean 50 nautical miles (93 km) off Queenstown, County Cork, United Kingdom by
SM U-48 ( Kaiserliche Marine).
Madura (Norway) The barque was scuttled in the Atlantic Ocean 50 nautical miles (93 km) south west of Queenstown by
SM U-48 ( Kaiserliche Marine) with the loss of two crew.
Saint Michel (France) The brigantine was scuttled in the Mediterranean Sea south of the Balearic Islands (37°55′N 1°15′E) by
SM U-34 ( Kaiserliche Marine).
HMT Senator (Royal Navy) The naval trawler struck a mine laid by
U 80 (Alfred von Glasenapp) and sank in the Atlantic Ocean off Tory Island, County Donegal (55°15′N 8°10′W) with the loss of eleven crew.
SM UC-36 (Kaiserliche Marine) The Type UC II submarine was rammed and sunk in the Bay of Biscay off Ouessant (48°42′N 5°14′W) by Molière ( France) with the loss of all 26 crew.