Mearc-þreát

According to the Old English Dictionary:

es;

mearc-þreát

m. A band of men occupying the frontier of a country :-- Manna þengel mearcþreáte rád (cf. Th. 187, 33: 188, 14), Cd. 151; Th. 188, 25; Exod. 173. mearc-þreat