שופטים ה:ז פירוש: רש״י, Metzudat David, Metzudat Zion ורד״ק

Exposure was discontinued. Exposed, unwalled cities were discontinued as dwelling places, because of the enemies, and they flocked to the fortified cities.

Inhabitation of the villages ceased, because they were afraid to settle in the unwalled cities. And this only ceased with Israel, but not with the other nations. As they were not afraid of Israel, such that they not dwell in unwalled cities. For they had the upper hand.

these are unwalled cities, without a wall around them