Britain suffers its first naval defeat in 100 years. Britain’s invasion of German East Africa fails. Germany and Russia lay into each other in Poland. Austria-Hungary has another go at invading Serbia. Germany loses its last Pacific possessions. Major fighting at Ypres comes to an end (for now).
[Poland] The Germans lick their wounds
Britain’s Egyptian conundrum
[NOTE: Possible inaccuracy: events described in this post may actually have happened in December 1914]
[Galicia] Przemysl besieged once more
[Mesopotamia] Britain takes Basra