@Cmdr:
I mentioned that in my results. If I remember correctly, 3,333 submarines were lost at sea and the attacker lost 1 destroyer. Now, if you really had those units, the attacker would still have 4,999 bombers and the defender would still have 6,667 submarines, but now the submarines have nothing to attack. :)
My thinking is if you remove the destroyer, than your bombers can’t hit submarines anymore. Planes can only hit subs if the destroyer is present