The seven priests bearing the seven trumpets of rams' horns before the ark of Yahweh went on continually, and blew the trumpets: and the armed men went before them; and the rearward came after the ark of Yahweh, [the priests] blowing the trumpets as they went.
The trumpets the priests blew (Joshua 6:4; Joshua 6:9, et al.) were not the long silver trumpets but rams horns (shophars). The blowing of trumpets in Israel reminded the people of God’s activity for them. The priests used them to call the people to follow God who was going before them in the wilderness. Both functions were applicable on this occasion. The trumpet blasts signaled judgment to the Canaanites but victory to the Israelites (cf. 1 Corinthians 15:51-52; 1 Thessalonians 4:13-17).