Transylvania – Battle of Kronstadt and the Geisterwald (until October 9): Falkenhayn attacks Rumanian Second Army, forces it from Fogaras (October 6) and retakes Kronstadt (October 8), takes Torzburg and pass (October 8-9). Rumanian Fourth Army continues advance in north.
Brusilov offensive, Pripet: Russian Eighth Army gains some ground west of Lutsk (until October 5).
Macedonia: Bulgars retreat to river Crna line (night October 2) after general Allied attack. British capture Yenikoi village east of Struma and hold against Bulgar attacks (until October 4), casualties 1,248 since September 30; 1,375 Bulgars killed; 342 PoWs taken.
Belgium: Gouverneur-General Bissing decrees forced labour in Germany for Belgian unemployed; 15,000 deported by 24; 50,000 by November 19.
Greece: Kalogeropoulos resigns, more officers leave to join Venizelos in Crete (October 2).