δι' ἐρημίας πολεμίων πορευόμενος → he marched on without finding any enemy, his route lay through a country bare of enemies
P. and V. ἀφύλακτος, ἄφρακτος, P. ἀφρούρητος.
bare: P. and V. ἐρῆμος.
unwalled: P. ἀτείχιστος.
unarmed: P. and V. γυμνός, P. ἄοπλος, V. ψιλός, ἄσκευος, ἀτευχής.