German soldiers in Lodz, December 1914. Image courtesy Deutsches Bundesarchiv.
- The Battle of Lodz ends after one month of fighting. The outcome is inconclusive; the Russians have repelled the Germans and saved Warsaw; the Germans, for their part, have caused the Russians to abandon their offensive into Silesia.
- The second Austrian invasion of Serbia ends as Belgrade is retaken by Serbian forces
- A German airship is sighted off the East Coast of England. This is the first appearance of enemy aircraft in the British Isles.
