What are the main events for the story "The Sniper?"
Liam O'Flaherty's "The Sniper" is a classic action and suspense story set during the Irish Civil War with a surprise ending. A sniper sits on the rooftop of a building pinned down by an enemy sniper on another rooftop across the street. When an old woman in the street below threatens to make his presence known to the enemy, the sniper is forced into action. To protect the secrecy of his presence, he kills both the old woman and the enemy soldier she attempts to inform. However, in the time it takes him to shoot these two individuals, the sniper on the rooftop across the street fires upon him, wounding him the arm. Now the sniper's only chance to survive is to somehow dispose of the enemy sniper across the street and escape the roof before morning. However, unbeknownst to the sniper, the identity of the man on the rooftop across the street complicates the story's resolution.