1 Samuel 26:5

David arose. It seems as if David could scarcely believe that Saul would thus a second time pursue him; but when the scouts informed him that it was really so, he went in person to reconnoitre Saul's camp. From the opposite hill he was able to see that he lay in the trench, i.e. the barricade formed by the wagons. At night Saul's place would be in the centre, with Abner near him, while the rest would lie sleeping around, but all of them within the rampart. When David reconnoitred them they would probably be arranging their wagons to form this barricade.