Amphibious assaults can be done in two steps, consisting of a sea battle and a land battle. In your example, both the cruiser and the transport would attack the destroyer. If the attackers win, the transport can offload and the land battle will occur. If the transport ends up retreating (or being sunk), the land battle will not occur and the transport may not offload.
Sub question
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Let’s say there is a German sub in SZ6, along w/a German cruiser. And I want to attack SZ6 w/a British battleship, bomber and 1 FTR. Can the German sub submerse before the British battleship gets a chance to fire on it if the German player so choses?
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Yes, before any of the UK units fire.
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Also note that your british fighters dont get to shoot at the german sub at all, as you are not bringing a destroyer along with you.





