Ah, stealing supplies. It never gets old. That's the kind of thing that makes you glad you are a mercenary, as opposed to, say, one of those people fighting down below on the battlefield for the glory of their country.
And with both undead and warforged on board, there was no risk of a useless loot from any or both sides.
I concur about the flags. It is very important to maintain the semblance of neutrality as long as possible, regardless of our intentions. We could also consider sending envoys as soon as we get a signal, rather than the entire squad.