It was so, that when Joshua had spoken to the people, the seven priests bearing the seven trumpets of rams' horns before Yahweh passed on, and blew the trumpets: and the ark of the covenant of Yahweh followed them.
The destruction of Jericho demonstrated the kind of warfare that Israel was engaged in. God’s unusual directions for the conquest of Jericho showed clearly that this was a religious judgment and Israel was his instrument. This was demonstrated in the important role of the priests, the prominence of the ark of the covenant, and the repeated use of the number seven in the battle preparations (6:1-7). Over the next six days the Israelites marched around Jericho once each day, and then returned to the camp at Gilgal (8-14).On the seventh day the Israelites were to march around the city seven times. When the walls of the city fell, they were to destroy all the people except Rahab and those in her house, and all the goods except the precious metals. The Israelites were to keep nothing for themselves (15-19).