@seththenewb:
Actually, it’s best to ask that question in the FAQ and/or shoot a PM to Gamerman01 or Krieghund. But I’m pretty sure you cannot conduct an amphibious assault unless you have at least 1 warship of some kind.
I can help too, but Gamerman is usually first to the scene…
The Amphibious assault can never occur. The subs can never be cleared (and no sub is EVER “forced” to submerge), so the subs will continue to fire, and their hits can only be assigned to transports, so eventually the attacker would be left with aircraft. Or, the attacker would retreat.
In this example, you wouldn’t necessarily need a destroyer to be successful, but you would need some naval ships capable of hitting the submarine or encouraging the owner to submerge it or lose it.