What is "sharpshoot"

Usage examples of "sharpshoot".

He said that he, with about fifty of their best men, had volunteered to keep up the demonstration, and it was his party that had occupied the traverse in our old works the night before and had annoyed us and the Battery men by their constant sharpshooting, which we fellows behind the old tree had finally tired out.

Unfortunately for the sec chief, the sharpshooting of Ryan Cawdor and his companions had rendered this option impossible, and so Jorgensen was forced to rely on words and some diagrammatic maps of the ground floor that lay above them.