'Rear guard' in the Bible

Then the standard of the camp of Dan set out, functioning as the rear guard for all the encampments, accompanied by its army with Ammishaddai's son Ahiezer.

Armed men preceded the priests who were blowing the trumpets, and a rear guard followed the ark, while the trumpets continued to blow.

The seven priests who carried the seven trumpets made from rams' horns preceded the ark of the LORD, blowing their trumpets constantly. The armed men preceded them, and the rear guard followed the ark of the LORD, while the trumpets continued to blow.

stationing their forces with its main encampment north of the city and its rear guard to the west. Joshua spent that night in the valley.

For you won't go out in haste, nor will you go in flight; for the LORD will go before you; and the God of Israel will be your rear guard. He is called the God of all the earth."