Joshua 6:8, 13

And it was so, that, when Joshua had spoken unto the people, the seven priests bearing the seven trumpets of rams’ horns before Jehovah passed on, and blew the trumpets: and the ark of the covenant of Jehovah followed them.

And the seven priests bearing the seven trumpets of rams’ horns before the ark of Jehovah went on continually, and blew the trumpets: and the armed men went before them; and the rearward came after the ark of Jehovah, the priests blowing the trumpets as they went.