The ultimate tactic is "crossing the T." To do so, position
your ships so that they form the top of the T and the enemy
forms the leg.
Accordingly, your vessels will be able to fire broadsides
at the hapless enemy, while the enemy can only engage you
with its bow turrets.
Torpedoes serve two purposes. First, they can bring down an
enemy ship quickly--they were the biggest killer of WWII.
Second, they can scatter an enemy task force, throwing off
its aim and making it easier to defeat.
Stay in the place where you fight. If you have big-gunned
ships, stay out of the lighter-gunned enemy cruisers' range.
There is no sense in taking unnecessary damage.
Destroyers are not battleships; don't try to trade salvos
with the bigger vessels. Destroyers are best used to dart
in, launch torpedoes, and then dart out.
The computer does an excellent job of ammunition selection,
but it can make mistakes. Make sure that you fire high-explosive
ammunition against thin-skinned vessels (such as destroyers)
and armor-piercing weapons against the thick-skinned battleships