1 Samuel 26:5

And David arose and came to the place where Saul had pitched, he himself made a scouting trip by night, accompanied by at least a few of his faithful men; and David, having reached a spot where he could overlook the entire camp of Saul, beheld the place where Saul lay, and Abner, the son of Ner, the captain of his host; and Saul lay in the trench, inside the wagon fortification, or rampart, and the people pitched round about him.