October 1916
| Date | Events |
|---|---|
| 1 | Battle of the Somme continues. Phases known as the Battle of the Transloy Ridges and Battle of the Ancre Heights begin |
| 1 | German airship L31 downed at Potter's Bar near London |
| 5 | Battle of the Cerna Bend and Monastir begins in Macedonia |
| 7 | In Battle of Brasov in Transylvania, the city is retaken by Austro-Hungarian forces |
| 8 | German submarine U-53 captures and destroys five ships outside Newport, Rhode Island, USA |
| 9 | Eighth Battle of the Isonzo begins, lasts four days |
| 10 | Allied governments send ultimatum to Greek government demanding surrender of Greek naval fleet; Greeks accept |
| 13 | Norwegian government orders prohibition of use of Norwegian waters by submarines of belligerent nations |
| 14 | German forces cross Transylvanian frontier into Rumania |
| 22 | Constanza in Dobrudja falls to German and Bulgarian forces |
| 24 | French forces open offensive phase of battle at Verdun: they recpature Douaumont |
| 25 | Cernavoda in Dobrudja captured by German forces |
| 26 | First German naval destroyer raid in Dover Straits |
| 28 | British hospital ship "Galecka" mined off Le Havre |
| 29 | Sherif of Mecca proclaimed King of the Arabs |
| 30 | Lt-Gen von Stein succeeds Lt-Gen Wild von Hohenborn as German Minister for War |
| 31 | Ninth Battle of the Isonzo begins, lasts five days |