Joshua 6:5-6

And it shall come to pass, that when they make a long {blast} with the ram's horn, {and} when ye hear the sound of the trumpet, all the people shall shout with a great shout; and the wall of the city shall fall down flat, and the people shall ascend up every man straight before him. {flat: Heb. under it} And Joshua the son of Nun called the priests, and said unto them, Take up the ark of the covenant, and let seven priests bear seven trumpets of rams' horns before the ark of the LORD.