The Iliad 21.529–530

calling the while to the glorious keepers of the gate along the wall: Wide open hold ye the gates with your hands until the folk shall come to the city in their rout, for lo, here at hand is Achilles, as he driveth them on; now methinks shall there be sorry work. But whenso they have found respite, being gathered within the wall,then close ye again the double doors, close fitted; for I am adread lest yon baneful man leap within the wall.