The army fled, and so the Israelites in the nearby cities fled. Courage failed all around.
What Saul tried to avoid in his life, happened anyway in his death. Matthew Henry says, ‘Saul slew himself to avoid being abused by the Philistines, and never was royal corpse abused as his was, perhapds the more if they understood he slew himself for that reason. He that thinks to save his honour by sin will certainly lose it.