Joshua 6:8

6:8 When Joshua gave the army its orders, the seven priests carrying the seven rams’ horns before the Lord moved ahead and blew the horns as the ark of the covenant of the Lord followed behind.

Joshua 8:20

8:20 When the men of Ai turned around, they saw the smoke from the city ascending into the sky and were so shocked they were unable to flee in any direction. In the meantime the men who were retreating to the desert turned against their pursuers.