"Come on everyone, let's get a move on before more of these f*ers arrive. I'll keep me ears and eyes open, and if need be Mother Nature will 'ide us. Let's go slow though and stay close, we're walkin' into a shoal of sharks 'ere."
Cassandra moves away from the position slowly, up the steep slope through the woods, assuming her companions will come with her.
I suggest we travel at a slow pace so that we can use Stealth. Cassandra will have Pass Without Trace ready, and at the first sign of danger will cast it. Relying on passive perception 17 - the hobgoblins at least are probably not being stealthy on their own mountain. From the discussion on the ooc thread, I take it we're travelling now, but not directly approaching the fortress until night time.
Rolls
Stealth - (1d20+1)
(15) + 1 = 16