(ˈmɒsˌtruːpə) n (Historical Terms) a raider in the border country of England and Scotland in the mid-17th century[C17 moss, in northern English dialect sense: bog]
moss•troop•er
(ˈmɔsˌtru pər, ˈmɒs-)
n. 1. a marauder who operated in the mosses, or bogs, of the border between England and Scotland in the 17th century. 2. any marauder. [1645–55]