Adam Clarke on 1 Samuel 31:3

He was sore wounded of the archers - It is likely that Saul's sons were slain by the archers, and that Saul was now mortally wounded by the same. Houbigant translates, The archers rushed upon him, from whom he received a grievous wound. He farther remarks that had not Saul been grievously wounded, and beyond hope of recovery, he would not have wished his armor-bearer to despatch him; as he might have continued still to fight, or have made his escape from this most disastrous battle. Some of the versions render it, He Feared the archers greatly; but this is by no means likely.