Naval/Air Battle Clarification

@AA337:

After a few rounds of combat, all that was left on
the attacker side  was 1 sub, a fighter and a bomber.  The defender only
had a transport and two fighters….our question was…
At what point does the naval battle end and the transport is destroyed?
Is it right after the defending navy is destroyed?  Or does another round of combat need to
be initiated? Does the sub have to roll on the transport?  Or is the transport immediately assumed destroyed after
the carrier is destroyed and the remaining battle is between the fighters?

Thanks for your help in advance.

Since the defender still has the fighters the combat will continue until all units (naval/air) of one side are destroyed (or even both sides) or the attacker withdraws. In your example, if the attacker decides to press the attack any hits made by the sub will be automatically assigned to the transport since there’s no other unit that the sub can hit.

@Hobbes:

Since the defender still has the fighters the combat will continue until all units (naval/air) of one side are destroyed (or even both sides) or the attacker withdraws.

There is a third option.  The battle will also end if neither side has any units that can hit combat units on the other side.  For example, if only the attacking sub and a defending fighter remain.  If the defending transport also remains at that point, it will be automatically destroyed, as the sub would hit it eventually.

As long as the battle continues (in this case, it continues as long as there are air units on both sides and the attacker doesn’t retreat), the sub must roll to hit the transport (or submerge).  The transport won’t be automatically destroyed until the battle is over (and then only if the attacker hasn’t retreated).