Your wives, your children and your livestock may stay in the land that Moses gave you east of the Jordan, but all your fighting men, ready for battle, must cross over ahead of your fellow Israelites. You are to help them
So Joshua son of Nun called the priests and said to them, “Take up the ark of the covenant of the Lord and have seven priests carry trumpets in front of it.”
When Joshua had spoken to the people, the seven priests carrying the seven trumpets before the Lord went forward, blowing their trumpets, and the ark of the Lord’s covenant followed them.