[@Eviledd1984], yes, a battle is starting, although that may work to D'Artagnan's advantage. Since he hasn't been spotted yet, he can still go sneaking around.
And at this rate, I think even if they weren't hostile, they would be now. I did just firebomb their village.
Also, don't forget that you've overheard the orcs' conversation about their shaman with mention of the king. Read that.