"Shoot your deck gun"
Ay Ay Sir.
Killed 2 destroyers by using my deck gun, one aircraft just passed by me as you can see on the minimap. I sunk a task force outside of gibraltar (1 aircraft carrier, 1 battleship and 3 destroyers sunk) with torpedos. Next, I enter gibraltar and another task force is chasing me. I had to kill two destroyers with my deck gun.
Clearly, the game is not well balanced or it may be that i'm too good with my deck gun