HMS Dublin Flag, Battle of Jutland (1916).

The Battle of Jutland was one of the key naval engagements of the First World War. HMS Dublin played a part in the battle, which was fought in 1916. The ship had been adopted by a committee of Dublin citizens and businessmen who raised funds to provide it with a band and other amenities. When the ship was decommissioned in 1926, Dublin Chamber of Commerce was presented with its battle-scarred ensign - complete with Union Jack - and in turn the Chamber donated it to Christ Church Cathedral, since when it has languished, unseen, in the cathedral crypt.