a guard in front; in plural outposts, videttes, piquets , (Xenophon Historicus); in singular, ἡ πρ. αὐτοῦ his advanced guard, (Xenophon Historicus); διὰ προφυλακῆς with an advanced guard , (Thucydides) (ML)
STRONG'S WORD STUDY
G8955 — προφυλακή
prophulakē · an advance guard · Greek