Deuteronomy 3:5

All these towns had high walls round them with doors and locks; and in addition we took a great number of unwalled towns.

Numbers 13:28

But the people living in the land are strong, and the towns are walled and very great; further, we saw the children of Anak there.

Deuteronomy 1:28

Where are we going up? Our brothers have made our hearts feeble with fear by saying, The people are greater and taller than we are, and the towns are great and walled up to heaven; and more than this, we have seen the sons of the Anakim there.

Hebrews 11:30

By faith the walls of Jericho came down, after they had been circled for seven days.

Treasury of Scripture Knowledge

Summary

All these cities were fenced with high walls, gates, and bars; beside unwalled towns a great many.

Bible References

General references

Deuteronomy 1:28
Where are we going up? Our brothers have made our hearts feeble with fear by saying, The people are greater and taller than we are, and the towns are great and walled up to heaven; and more than this, we have seen the sons of the Anakim there.
Numbers 13:28
But the people living in the land are strong, and the towns are walled and very great; further, we saw the children of Anak there.
Hebrews 11:30
By faith the walls of Jericho came down, after they had been circled for seven days.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain