Thought on PB's

[Justme]

I'm sure this will get shot down but anywho.

Have 72 hour time once a port battle is initiated for both attackers and defenders.

Anyone from respective nation on either attacker or defender can be involved but only once. If you retreat/sunk that's it you cannot enter again for duration of 72 hour limit.

Have clear objective(s) for victory/defeat. Not sure as of now but can be expanded later.