The meaning of Fenced cities in the Bible
(From Easton's Bible Dictionary)

There were in Palestine (1) cities, (2) unwalled villages, and (3) villages with castles or towers (I Chronicles 27:25). Cities, so called, had walls, and were thus fenced. The fortifications consisted of one or two walls, on which were towers or parapets at regular intervals (II Chronicles 32:5; Jeremiah 31:38). Around ancient Jerusalem were three walls, on one of which were ninety towers, on the second fourteen, and on the third sixty. The tower of Hananeel, near the north-east corner of the city wall, is frequently referred to (Nehemiah 3:1; 12:39; Zechariah 14:10). The gateways of such cities were also fortified (Nehemiah 2:8; 3:3,6; Judges 16:2,3; I Samuel 23:7).

See more on the meaning of Fenced Cities in the Bible:
Fenced Cities {International Standard Bible Encyclopedia}

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