The rule says "the torpedo boat is placed on the left or right broadside gun line from any enemy ship that has not moved". I wondered how you could determine whether the ship has moved until I looked more closely at the Submarine rules, which say "... a ship that has not moved in the previous turn." So I am assuming that is the intent with the spar torpedo attack also. Right?
Yes.
Thanks for the confirmation. Once I spotted it, it seemed pretty certain, but I had to ask! :)