What is 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 called?

mosstrooper — 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. (Webster's 1913.)