(There is no possible way the armor-wearing, not-trained-in-Move-Silently hobgoblins are going to defeat that check.  The six warriors are in<em>half-plate</em>for Maglubiyet's sake; rolling for all of them would be pointless.<br/><br/>If you need positions, two warriors are standing on either side of the doorway, with two more directly south of them and the last two directly south of<em>them</em>.  The marshal is stationed just south of the entrance to the vault hallway (i.e. just south of the southern insect-hive trap).  Margash and Harkmeet are on the east wall of the room, one and two spaces south from the north wall respectively.)