The summary provides the key details of the short story "The Sniper" by Liam O'Flaherty in 3 sentences: An IRA sniper posts himself on a rooftop in Dublin during the Irish Civil War and kills an enemy turret gunner and an old woman, but is then shot in the arm by an opposing sniper across the way. Using a plan to trick the other sniper, he fakes his death and shoots his enemy when he lets his guard down, only to discover that the other sniper was actually his brother.