Germany wants to invade the UK with 3 transports and air support. The sea zone is defended by two french ships (cruiser and destroyer) and a British submarine.

What happens in the sea battle? The french boats and fighters obviously fight it out. The sub can only fire at boats. But when the two french boats inevitably fall to the 4 fighters and two bombers. What happens next?

1.The submarine destroys the transports, as they cannot fire back and the planes cant shoot the submarine.

or

2. The submarine only gets to fire its first shot attack on the transports and is forced to submerge, as the battle continues, and the remaining transports get to offload their ground units after the french boats are destroyed