de bello gallico, 5.32

But the enemy, after [postea quam = posteaquam by tmeses] they sensed from the nighttime commotion and wakefulness (lit. pl.) about their departure, with an ambush (pl. noun) set in two parts about two miles away in a suitable and hidden spot in the woods, were awaiting the advance of the Romans and, when the greater part of the line had lowered itself into a great valley, they showed themselves suddenly from each side of this valley and began to press the last men and to keep the first from ascending and to join battle with our men on a most disadvantageous spot.