13th August 1918
Western Front
French capture Belval (1.5 miles south from Lassigny).
Eastern Front
Appeal of General Dieterichs to Allied Naval and Military Commanders at Vladivostok for help.
Release of Messrs. Lockhart and Wardrop.
Naval
Italian Navy deliberately sinks the outdated cruiser Etruria to make it seem Austro-Hungarian agents (turned double agents by Italy) were successful in their sabotage.
Aviation
Lothar von Richthofen, brother of Manfred von Richthofen (Red Baron) and German ace with 40 victories, is shot down. Lothar survives, but he is seriously injured and does not fly for the duration of the war.
Political, etc.
British declaration recognising Czecho-Slovaks as Allied nation; latter declare war on Germany.
Ship Losses:
Anhui (United Kingdom) The cargo ship was torpedoed and sunk in the Mediterranean Sea 2 nautical miles (3.7 km) south east of Capo Greco, Cyprus (35°04′N 34°08′E) by
SM U-27 ( Austro-Hungarian Navy) with the loss of four of her crew.
City of Brisbane (United Kingdom) The cargo ship was torpedoed and sunk in the English Channel 1.5 nautical miles (2.8 km) south of Newhaven, Sussex by
SM UB-57 ( Kaiserliche Marine). Her crew survived.
Etruria (Regia Marina) The Umbria-class cruiser was destroyed at Livorno by the explosion of an ammunition barge moored alongside her.
Frida (Denmark) The barque was shelled and sunk in the North Sea 40 nautical miles (74 km) east of the mouth of the River Tyne by
SM UB-104 ( Kaiserliche Marine) with the loss of seven of her crew.
Jönköping I (Sweden) The cargo ship was sunk in the North Sea off Robin Hood's Bay, Yorkshire, United Kingdom by
SM UB-104 ( Kaiserliche Marine). The ship broke in two, with the bow section sinking and the stern section being beached at South Shields, County Durham where it was scrapped in 1919. Five of her crew perished.
La Chaussade (France) The cargo ship was sunk in the Mediterranean Sea off La Galite, Tunisia by
SM UC-27 ( Kaiserliche Marine) with the loss of four of her crew.
SMS T67 (Kaiserliche Marine) The S66-class torpedo boat struck a mine and sank in the North Sea with the loss of two of her crew.
SM UB-30 (Kaiserliche Marine) The Type UB II submarine was depth charged and sunk in the North Sea 3 nautical miles (5.6 km) north north east of Whitby, Yorkshire, United Kingdom (54°32′N 0°36′E) with the loss of all 26 crew.