From just beyond your field of vision, behind one of the buildings just beyond the square, you hear a harsh voice hiss, "Quiet as we go boyz. Get the fayree, and we gets out. Don't bollocks it up!"
A moment later, a troop of skulking Goblins, three grunts, led by larger one flanked by two even larger Bugbears rounds the corner. They give a start and their eyes widen at the sight of you.
"Crikey, that's them what whacked Pinky! Looks like sneakin's off the menu!" the leader exclaims. He points a gnarled finger at you, and shouts, "Take 'em out fast!"
Everyone, please roll intitative!
GM Note: The horde is a little farther than you can move in one action. They have just rounded the corner of a cottage along one of the smaller paths leading off the square, but the structures are setback from it, so the area between them isn't constrained enough to create a tactical chokepoint. I'll give more details if you need them. :)