21st July 1918
Western Front
French recapture Chateau-Thierry.
Allied progress in Ardre valley continued; Bois de Courton captured.
Naval and Overseas Operations
Portuguese East Africa: battle between British and Germans at Namirrue (near confluence of Rivers Namirrue and Ligonya).
German submarine SM U-156 shells the town of Orleans, Massachusetts, sinking 1 tugboat and 4 barges. There were no casualties, but it is the only German attack on the mainland US and the first foreign shelling since 1846.
Two United States Navy seaplanes from Naval Air Station Chatham, Chatham, Massachusetts, attack a surfaced German submarine that is firing at a tug and three barges off Cape Cod, Massachusetts. One bomb strikes the submarine, but is a dud.
Political, etc.
Appeal of Ministry of Munitions to workers not to strike during critical battle.
Ship Losses:
Anna (Denmark) The barquentine was sunk in the North Sea 35 nautical miles (65 km) off Bergen, Hordaland, Norway by SM U-113 ( Kaiserliche Marine). Her crew survived.
Arvor (France) The coaster was sunk in the Atlantic Ocean 27 nautical miles (50 km) north of Ouessant, Finistère (48°55′N 4°09′W) by SM UB-103 ( Kaiserliche Marine).
Kongen (Norway) The sailing vessel was damaged in the North Sea 70 nautical miles (130 km) south west of Lindesnes, Rogaland by SM UB-113 ( Kaiserliche Marine). She was abandoned by her crew. The derelict was scuttled on 5 August by HMS G1 ( Royal Navy).
Lansford (United States) The schooner barge was sunk in the Atlantic Ocean 3 nautical miles (5.6 km) off Orleans, Massachusetts by SM U-156 ( Kaiserliche Marine).
Mongolian (United Kingdom) The passenger ship was torpedoed and sunk in the North Sea 5 nautical miles (9.3 km) south east of Filey, Yorkshire (54°10′N 0°58′W) by SM UC-70 ( Kaiserliche Marine) with the loss of 36 lives.
703 (United States) The schooner barge was sunk in the Atlantic Ocean 3 nautical miles (5.6 km) off Orleans, Massachusetts by SM U-156 ( Kaiserliche Marine).
740 (United States) The schooner barge was sunk in the Atlantic Ocean 3 nautical miles (5.6 km) off Orleans, Massachusetts by SM U-156 ( Kaiserliche Marine).
766 (United States) The barge was sunk in the Atlantic Ocean 3 nautical miles (5.6 km) off Orleans, Massachusetts by SM U-156 ( Kaiserliche Marine). Her crew survived.
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