[TheDrone]

Battleships on oceans would obviously be used to block the transfer from resources from that continent. Then the objective would be to either use other battleships to take the enemy fleet out with long range tactical bombardments. You'd have a captain, a few gunners for the main guns and a bunch of other gunners.

The awesomeness would really start when both sides would try to capture/sabotage the other side's ships with ground combat.
You could use amphibious craft and galaxies to get the troops to the other ships and capture section by section in intense close-quarters combat.


EDIT: I agree it's unlikely the future would have ships. But this would be for exactly the same reason they wouldn't have ground warfare: because you can bomb everything/anything from orbit.

However, space combat in the same manner would also be awesome.