Western Front
Somme sector: British still advance north and south of Peronne; approach high ground on Athies-Nurlu front; local fighting about Moeuvres and Neuville-Bourjonval.
Steady advance of General Humbert's Army from Noyon towards St. Quentin; crosses Somme canal and approaches within three miles of Ham.
Vesle sector (east of Soissons) Franco-American troops drive Germans north towards the Aisne, reaching the river in Conde sector. The french Foreign Legion’s 3rd Battalion storms MG-studded Terny-Sorny, then held at Allemant (September 6).
Meuse: AEF St Mihiel attack set for September 12.
Western Front, Air: RAF reduces low-flying fighter ops to recuperate, losses fall dramatically until September.
Canada: Royal Canadian Naval Air Service founded.
French Schneider Modele 1912 railway gun, dismounted from its carriage onto a turntable and extensively camouflaged for heavy long-range fire support:
https://i1.wp.com/ww2-weapons.com/w...y-gun.jpg?ssl=1
A British soldier demonstrates a German bicycle frame used to generate electricity in the trenches: © IWM (Q 7046):
https://twitter.com/CenturyAgoToday...281712944947202
British soldier with an overturned German 10cm gun at Moislains, Somme: © IWM (Q 7043):
https://twitter.com/CenturyAgoToday...343382618734592
Eastern Front
Ukraine: Hetman Skoropadski in Berlin; 1918-19 Economic agreement signed at Kiev on September 11
Southern Front
Italian and British officers compete at a horse jumping competition at Trissino, Italy: © IWM (Q 25800):
https://twitter.com/CenturyAgoToday...313168131993601
Asiatic and Egyptian Theaters
Arabia: The Hejez Arabs continue to harry the Turks in frequent raids round Medina.
Persia: Up to 2,000 Turks with 2 guns (11th Caucasian Division) advance along Tabriz road vs 660 British and irregulars, occupy Turkmanchai (September 7) and Mianeh (September 9), patrols reach Zenjan after British Kullan Kuh mountain position outflanked on September 12, but by September 21 recalled to Constantinople.
Siberia: Khabarovsk taken by Japanese forces (see 18th, and August 11th).
Naval and Overseas Operations
American troopship USS
Mount Vernon is attacked by the German submarine
U-82, killing 36 sailors, but the ship remains afloat:
https://twitter.com/CenturyAgoToday...251503138983937
Political, etc
United Kingdom: Arrest in London of M. Litvinov and other Bolsheviks, in a tit-for-tat guarantee for the safety of British subjects in Russia.