How many priests and how trumpets were used in the siege of Jericho?

The Bible mentions that Joshua used seven priests and seven trumpets in the siege of Jericho. According to the book of Joshua, the priests blew the trumpets and the Israelite army marched around the city once a day for six days. On the seventh day, they marched around the city seven times and then blew their trumpets. The walls of Jericho then fell down, and the Israelites were able to enter the city and conquer it.