18th September 1918
Western Front
Great Australian (5th/6th Australian Infantry Brigades) advance on 16-mile front (north-west of St. Quentin, extending from Holnon Wood to Gouzeaucourt; over 6,000 prisoners and a number of guns captured; outer defences of Hindenburg Line stormed in many places.
French, in liaison with British, capture Savy Wood and Fontaine-les-Cleres.
End of battle of Epehy.
Germans continue strong counter-attacks north and south of Moeuvres.
Eastern Front
Murmansk front: Karelians defeat German-led forces from Finland at Ukhtinskaya and drive them back over the border.
Japanese coverging from east and south take Blagoveshchensk (on the Amur) and Alexeievsk. 2,000 Germans and Austrians lay down their arms.
Southern Front
Bulgarians in full retreat before French, Serbians and Yugo-Slavs; Serbian cavalry reaches Polosko; communication with Prilep (Bulgarian advanced base) cut.
Anglo-Greeks attack in neighbourhood of Lake Doiran and take the town.
Asiatic and Egyptian Theatres
Arab force surrounds Dera'a and blows up railway junction.
Aviation
A U.S. Navy Curtiss 18-T-1 triplane piloted by Roland Rholfs sets a world altitude record of 34,910 feet (10,640 m).
Political, etc.
Complete failure of the Austro-Hungarian peace offer, which is rejected by Great Britain, France, U.S.A. and Belgium in turn.
Ship Losses:
Adelphotis (Greece) The sailing vessel was sunk in the Mediterranean Sea (36°14′N 25°25′E) by
SM U-27 ( Austro-Hungarian Navy). Her crew survived.
Agios Amma (Greece) The sailing vessel was sunk in the Mediterranean Sea (36°14′N 25°25′E) by
SM U-27 ( Austro-Hungarian Navy). Her crew survived.
Buffalo (France) The cargo ship was torpedoed and sunk in the Atlantic Ocean 2 nautical miles (3.7 km) east of St Agnes Head, Cornwall, United Kingdom (50°19′N 5°18′W) by
SM UB-117 ( Imperial German Navy).
Helena (United States) The cargo ship ran aground on West Chicken Island, Lake Erie. She broke in two on 25 September and was a total loss.
John O. Scott (United Kingdom) The cargo ship was torpedoed and sunk in the Atlantic Ocean 9 nautical miles (17 km) west by north of Trevose Head, Cornwall (50°32′N 5°16′W) by
SM UB-117 ( Imperial German Navy) with the loss of eighteen of her crew.
Ledaal (Norway) The cargo ship was scuttled in the Atlantic Ocean (33°50′N 20°05′W) by
SM U-157 ( Imperial German Navy) with the loss of a crew member.
Primo (United Kingdom) The cargo ship was torpedoed and sunk in the Atlantic Ocean 3.5 nautical miles (6.5 km) north north west of the Godrevy Lighthouse, Cornwall (50°17′N 5°28′W) by
SM UB-117 ( Imperial German Navy). Her crew survived.