'Walls' in the Bible

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

"Hear, Israel, you [are] about to cross the Jordan today to go to dispossess nations larger and more numerous than you, great cities fortified {with high walls},

At the end of every three years take a tenth part of all your increase for that year, and put it in store inside your walls:

Only those trees which you are certain are not used for food may be cut down and put to destruction: and you are to make walls of attack against the town till it is taken.

And he shall besiege thee in all thy gates, until thy high and fenced walls come down, wherein thou trustedst, throughout all thy land: and he shall besiege thee in all thy gates throughout all thy land, which the LORD thy God hath given thee.