Though the armed men went before, yet their services would not be required. The victory God our Saviour had graciously reserved to himself. Silence throughout the camp intimated as much, similar to what was said to Israel, at the Red Sea. Exodus 14:13-14.
Related Commentaries of Joshua 6:9
Joshua 6:9-10
9 And the armed men went before the priests that blew with the trumpets, and the rerewardb came after the ark, the priests going on, and blowing with the trumpets.
10 And Joshua had commanded the people, saying, Ye shall not shout, nor make any noisec with your voice, neither shall any word proceed out of your mouth, until the day I bid you shout; then shall ye shout.