Joshua 6:3-5 NIV

3 March around the city once with all the armed men. Do this for six days.
4 Have seven priests carry trumpets of rams’ horns in front of the ark. On the seventh day, march around the city seven times, with the priests blowing the trumpets.

References for Joshua 6:4

5 When you hear them sound a long blast on the trumpets, have the whole army give a loud shout; then the wall of the city will collapse and the army will go up, everyone straight in.”

References for Joshua 6:5