'Rear guard' in the Bible

And the armed [men] went before the priests who blew the trumpets, and the rear guard came after the ark, while they were blowing the trumpets.

The seven priests carrying the seven trumpets of the rams' horns before the ark of Yahweh went on continually, and they blew on the trumpets. And the armed [men] went before them, and [the] rear guard came after the ark of Yahweh, while the trumpets blew continually.

So they stationed the forces; all the army [was] north of the city while {the rear guard was west}. But Joshua went that night to the middle of the valley.