ἔμφρουρ-ος · emphrour-os — LSJ
on guard at a post
on guard at a post, X. HG 1.6.13.
2 liable to military duty
liable to military duty (cf. φρουρά), opp. ἄφρουρος, Id. Lac. 5.7.
II held by garrisons
Pass., held by garrisons, πόλεις ἐμφρούρους ποιεῖ Decr. ap. D. 18.182, cf. Plb. 2.41.10, etc.
III shut up in, kept, in prison
shut up in, τῷ ταύρῳ Phalar. Ep. 147.3; οἷον ἔ. kept as it were in prison, Longin. 44.4, cf. Jul. ad Ath. 272d.