Your wives, your little ones, and your cattle shall dwell in the land which Moses gave you on this side of the Jordan, but all your mighty men of valor shall pass on before your brethren [of the other tribes] armed, and help them [possess their land]
So Joshua son of Nun called the priests and said to them, Take up the ark of the covenant and let seven priests bear seven trumpets of rams' horns before the ark of the Lord.
When Joshua had spoken to the people, the seven priests bearing the seven trumpets of rams' horns passed on before the Lord and blew the trumpets, and the ark of the covenant of the Lord followed them.