18 December 1914
- King Haakon VII of Norway, King Gustav V of Sweden, and King Christian X of Denmark meet at Malmo in Sweden to confirm joint Scandinavian neutrality during the war
- Britain proclaims Egypt as a protectorate. The British press bureau releases the following statement:
In view of the state of war arising out of the action of Turkey, Egypt is placed under the protection of His Majesty and will henceforth constitute a British Protectorate. The suzerainty of Turkey over Egypt is thus terminated and His Majesty’s Government will adopt all measures necessary for the defence of Egypt and the protection of its inhabitants and interests.
- The Battle of the Rawka-Bzura begins in Poland