Now Jericho was tightly shut up because of the children of Israel: none went out, and none came in.
As regards the size of Jericho, it was by no means a large city by modern standards, nevertheless a very powerful and important city. Woudstra gave the dimensions of a number of ancient cities thus: (1) Jericho was 225 10:80 meters, about 600 meters in circumference.  (2) Jerusalem at the time of David's capture of it was 400 10:100 meters.  (3) Shechem was 230 10:150 meters.[11]  "Most of the remains in that area from the times of Joshua have been eroded and washed away."[12]