Very nice surprise! I am working on a WWI mod, and lots of WWI battleships and armoured cruisers had torpedo tubes - even the old pre-dreadnoughts built in the 1890's. It will be hilarious when a player closes in to sink a "helpless" damaged battleship - and then gets blown out of the water.
The British also put big steam launches on their battleships; these were 40-50 foot steamboats that could carry two 14" torpedoes and one medium-sized deck gun, along with MG's....in an emergency they could be lowered over the side and used to hunt submarines.