On This Day - 21 September 1916
Theatre definitions: Western Front comprises the Franco-German-Belgian front and any military action in Great Britain, Switzerland, Scandinavia and Holland. Eastern Front comprises the German-Russian, Austro-Russian and Austro-Romanian fronts. Southern Front comprises the Austro-Italian and Balkan (including Bulgaro-Romanian) fronts, and Dardanelles. Asiatic and Egyptian Theatres comprises Egypt, Tripoli, the Sudan, Asia Minor (including Transcaucasia), Arabia, Mesopotamia, Syria, Persia, Afghanistan, Turkestan, China, India, etc. Naval and Overseas Operations comprises operations on the seas (except where carried out in combination with troops on land) and in Colonial and Overseas theatres, America, etc. Political, etc. comprises political and internal events in all countries, including Notes, speeches, diplomatic, financial, economic and domestic matters. Source: Chronology of the War (1914-18, London; copyright expired)
At Verdun, French take trenches south-east of Thiaumont Work and over 100 prisoners.
South of the Ancre, during night, British troops advance between Flers and Martinpuich.
In Transylvania, Romanian left held up near Vulkan Pass (south of Petrozseny).
Fighting in Kealeman and Gorgeny mountains (Transylvania), Romanians taking prisoners.
Allies pressing along the roads north of Florina.
Serbians within sight of Monastir.
Naval and Overseas Operations
German submarine destroyed at Hagios-Kosmos (east of Phaleron, Greece).
Paris: General Duport gazetted Chief of the Staff, staff attached to Ministry of War.