@Jonny5tyle Yes, if there are any units left in the convoy after the first (and subsequent) round(s) of combat two units escape from the convoy.
This also applies when there is still a normal sea/air battle in progress. Every round that this combat lasts two convoy units escape. But as long as the defender still has combat units left, the units in the convoy cannot be taken as casuality.

Best posts made by JohnBarbarossa
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RE: Multiple rule questions
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RE: Multiple rule questions
I think that the OP @Driel310 meant to ask what the limit was of the number of simultaneous sea mines in a seazone but his wording was a bit unclear.
For landmines the rulebook is clear. You can build as many as you want in one territory. But for sea mines this is rather unclear.
I am sorry to say this but the rulebook is really poorly written.
Anyway I saw in this video today that there were multiple mines placed in one seazone:
https://www.youtube.com/watch?v=ACc_AwEvqVg&t=2793s
At around 6:05
Can someone confirm if that is correct?