Charles Ellicott Commentary Joshua 6:13

"And the seven priests bearing the seven trumpets of rams` horns before the ark of Jehovah went on continually, and blew the trumpets: and the armed men went before them; and the rearward came after the ark of Jehovah, [the priests] blowing the trumpets as they went." — Joshua 6:13 (ASV)

The priests going on. —Literally, with going, and blowing the trumpets. “The priests” is inserted by the Targum.