Joshua 6:8, 13

And it was so, that when Joshua had spoken to the people, the seven priests carrying the seven trumpets made of rams’ horns went on before the LORD and blew the trumpets; then the ark of the covenant of the LORD went behind them.

The seven priests carrying the seven trumpets made of rams’ horns ahead of the ark of the LORD went on continually, blowing the trumpets; and the armed men went ahead of them and the rear guard came after the ark of the LORD, while the priests continued to blow the trumpets.