The man shurgs.
I don't know, but we got some of them as prisoners remember? And as I said before, I do not think we can catch those who fled. They have a good headstart already, and we don't have any clue which direction they fled in, so if we just pick a random direction, its likely we end up sailing for months and find nothing, while the pirates get away. Now we COULD split up and try to cover every direction, but that would be incredibly risky, and would probably just end up with the poor suckers who do end up finding them getting caught and killed.
I still suggest you should call this a success, go back, report to your superiors of who you caught, and the lair being burnt down, and see if they give you any new orders. And see if that letter the admiral gave you helps any. Maybe you might get promoted, who knows. But again, as I said before if you do wish to gamble, and just go after them in a random direction ill follow, but it is very, very unlikely we will catch them, and we just end up wasting time. And honestly we should be taking care of the prisoners we got, and deliver them back to be interrogated, tried, and hanged.