Aeneid 9.168–175

168The Trojans look out on this from the rampart above and hold the heights with arms; and, anxious with fear, they also test the gates, join up bridges and battlements, and carry weapons. 171Mnestheus and fierce Serestus urge them on, whom father Aeneas appointed to be leaders of the young men and masters of affairs, should adversity ever call. 174All the troops along the walls, sharing out the danger by lot, keep watch and take turns, each at the post he must guard.