וְהֶחָל֣וּץ הֹלֵ֔ךְ לִפְנֵי֙ הַכֹּ֣הֲנִ֔ים תקעו [תֹּקְעֵ֖י] הַשּֽׁוֹפָר֑וֹת וְהַֽמְאַסֵּ֗ף הֹלֵךְ֙ אַחֲרֵ֣י הָאָר֔וֹן הָל֖וֹךְ וְתָק֥וֹעַ בַּשּׁוֹפָרֽוֹת׃
And the armed men went before the priests that blew the horns, and the rearward went after the ark, [the priests] blowing with the horns continually.
Read kabbalistic (mystical) interpretation of Joshua 6:9: and classical mystical sources.