Western Front
Battle of the Somme: 4 German counterattacks fail at High Wood (and on September 3, 8 and 15) but they recapture East side of Delville Wood.

Eastern Front
Bulgaria declares war on Romania.
Turkish VI Corps placed under Mackensen.
Transylvania: Romanians capture Hermannstadt. Sibiu also taken by Rumanian forces (see 26th).
Fresh successful Russian advance in Volhynia.
Galicia: Russian General Shcherbachev takes 19,000 PoWs on river Zlota Lipa (until September 4).

Southern Front
Bulgars in possession of 17 Greek forts.

Asiatic and Egyptian Theaters
Armenia: Turk IV Corps attacks south of Kigi but Russian reinforcements stabilize front by September 10. French Arab Mission reaches Alexandria.
Mesopotamia: Chormuk, N. Euphrates, captured by Russians.
25 bombs dropped on Port Said.

Naval and Overseas Operations
Channel, North Sea: Flanders UB-type boats sink over 30 ships in a week without encountering one warship (570 ASW vessels available); 1,949 British merchantmen now armed with guns.
Black Sea: New Russian dreadnought battleship Imperatritsa Maria fires at and pursues Goeben (rescues Turk seaplane) to within 60 miles of Bosphorus.
Aegean: 23 Allied warships and 4 transports (from Salonika) anchor 4 miles off Piraeus near Greek Fleet at Salamis, in a “demonstration” of Allied fleet.

Political, etc.
United Kingdom: Russian and British Governments conclude "Sykes-Picot" agreement as to eventual partition of Asia Minor (see April 26th, and May 9th and 23rd).
Retail Food Price 65% (up 5%). Munition factories total 4,212 (with 435 canteens for 640,000 workers). Civilian war prisoners to be supplied to private firms. In September War Propaganda Bureau starts monthly War Pictorial magazine (circ 750,000 by November 1917).
Russia: In September Anglo-Russian Bureau (propaganda) opens in Petrograd.
United States: In New York, value of German Mark at 30% discount.
New Zealand: Compulsory Military Service Bill comes into operation (see June 10th).
Greece: Allied fleet seizes 13 interned Austro-German ships.

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On the kinkometer, my kink measures as a sine wave.