Rufus, what is this ship like? Do we know? Is it like a grand flagship or a little elf schooner?
Without Julian and Ragni, we have:
Max
Admund
Hans
Heinrich
Mortus
Is sending 5 people to sneak aboard a ship ok if it's a grand ship? If it's small, then Hans Heinrich and Mortus might do well with their climbing and sneaking abilities (and Mortus casting sleep).
Max and Admund could go after Groenwould with the dwarfs. It's a side quest though, so if Rufus thinks more people should go on the raid, then let's do that.