Joshua 6:1 Now Jericho was securely shut up because of the children of Israel; none went out, and none came in.

2 And the Lord said to Joshua: “See! I have given Jericho into your hand, its king, and the mighty men of valor.

Vs 20  So the people shouted when the priests blew the trumpets. And it happened when the people heard the sound of the trumpet, and the people shouted with a great shout, that the wall fell down flat. Then the people went up into the city, every man straight before him, and they took the city.