John Wesley on 2 Samuel 17:9

Pit - Having been often accustomed to that course, and well acquainted with in all hiding - places from Saul's time. In one of them, unknown to us, he will lurk with some of his chosen men, and lie in ambush for us; and, when they see a fit opportunity, they will suddenly come forth and surprize some of our men, when they least expect it, and probably at first put them to flight. Some - Namely, of Absalom's men sent against David. At the first - Implying, that their good success at first would mightily animate David's men to proceed vigorously in the fight, and intimidate Absalom's army, and consequently would be both a presage and an occasion of their total defeat.