So Joshua son of Nun summoned the priests and said, "Take up the ark of the covenant and have seven priests carry seven rams' horns in front of the ark of the LORD."

Joshua 6:5
And when there is a long blast of the ram's horn and you hear its sound, have all the people give a mighty shout. Then the wall of the city will collapse and all your people will charge straight into the city."

Joshua 6:7
And he told the people, "Advance and march around the city, with the armed troops going ahead of the ark of the LORD."

1 Samuel 4:3
When the troops returned to the camp, the elders of Israel asked, "Why has the LORD brought defeat on us before the Philistines today? Let us bring the ark of the covenant of the LORD from Shiloh, so that it may go with us to save us from the hand of our enemies."

And Joshua the 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.