There is no rolling versus defenseless transports. By definition, transports that can retreat are not defenseless, so combat would be conducted normally.
Perfect. Thanks!
If a sub attacks a lone transport outside an enemy island with an airbase and fighters, is the transport automatically sunk, or does scrambling do anything to prevent that?
The fighters can scramble. However, since there is no defending destroyer, they can’t hit the sub. As a result, the transport will be sunk anyway.