Diary for Monday, December 13, 1915:
Adriatic: Fourth and last Austrian Tegetthott-class dreadnought Szent Istvan completed at Pola.
Meuse: French destroy last German pontoon bridge at St Mihiel.
Serbia: Bulgars occupy Doiran and Gevgel.
Arabia: McMahon letter to Sherif Hussein asks for more time, but sends £20,000. British friendship treaty with Ibn Saud.