The Grand Fleet conducted another fruitless sweep of the North Sea in late December and, while trying to enter Scapa Flow in a Force 8 gale and minimal visibility, "Monarch" was accidentally rammed by "Conqueror" on 27 December. The former had to unexpectedly manoeuvre to avoid a guardship at the entrance and "Conqueror" could not avoid her. "Monarch" suffered moderate damage to her stern and received temporary repairs at Scapa before proceeding to Devonport for full repairs on 4 January 1915, rejoining the Grand Fleet on 20 January.