Rapparee

(n.) A wild Irish plunderer, esp. one of the 17th century; -- so called from his carrying a half-pike, called a rapary.

Thesaurus Entries

depredator, despoiler, forager, forayer, freebooter, marauder, pillager, plunderer, raider, rapparee, ravager, ravisher, reiver, rifler, sacker, spoiler, spoliator, wrecker