Your wives, young children, and livestock may remain in the land Moses gave you on this side of the Jordan. But your fighting men must cross over in battle formation ahead of your brothers and help them
So Joshua son of Nun summoned the priests and said to them, “Take up the ark of the covenant and have seven priests carry seven trumpets in front of the ark of the Lord.”
After Joshua had spoken to the people, seven priests carrying seven trumpets before the Lord moved forward and blew the trumpets; the ark of the Lord’s covenant followed them.