Battle of the Somme: German counter-attack at Eaucourt. British lose Le Sars, weather breaks: ‘rain fell in torrents, and the battle area became a sea of mud … men died from the effort of carrying verbal messages’ (official historian General Edmonds). Preparations for another great British attack c. October 12 are soon abandoned.
German First Army report recommends that Germany produce her own tanks. Haig tells President Poincare that Germans must not be given ‘a moment’s peace’.
Brusilov offensive, Carpathians: 2 regiments of VII Siberian Corps twice refuse to attack (until October 3); 3 soldiers shot and 6 imprisoned; first of more than 12 mutinies until January 13, 1917.
Transylvania: Rumanian First Army breaks through Rotenturm Pass taking 3,000 Bavarian PoWs and 13 guns.
Rumania – Manoeuvre of Flamandra: Averescu crosses Danube against Mackensen’s rear, takes 13 guns, but poor bridges, Austrian monitors, and sudden flood force withdrawal until October 3.
Italian Front: Alpini seize crests of Mts Colbricon, Costabella (October 5), over 6,000 ft.
Albania: Italians occupy Santa Quaranta on coast (until October 4) and Premeti at inland on October 9.
Salonika: Bulgar poet Dimcho Debelyanov killed, aged 29, in action with British between Dolno and Gorno villages.
Arctic: U43, U46 and U48 carry out 8-day operation against Allied shipping off North Cape and Murmansk coast; 14 ships sunk, 9 captured. (In summer 600 steamers – mainly British - have delivered 1 mt of coal and 1 1/2 mt supplies to Russia.) In response, 3 RN submarines operate from Archangel.