1) Any marauder 1) Combatant 
• (n.) One of a class of marauders or bandits that formerly infested the border country between England and Scotland; -- so called in allusion to the mossy or boggy character of much of the border country.
Moss'troop`er noun [ Moss + trooper .] One of a class of marauders or bandits that formerly infested the border country between England and Scotland; -- so called in allusion to the mossy or boggy character of much of the border country. 
The Mosstroopers were bandits who plagued the border area between England and Scotland. They were so named from camping on the mosses.
a marauder who operated in the mosses, or bogs, of the border between England and Scotland in the 17th century. · any marauder.