'Rear guard' in the Bible

The standard of the camp of the Danites set out, which was the rear guard of all the camps by their companies; over his company was Ahiezer son of Ammishaddai.

Armed troops marched ahead of the priests blowing the horns, while the rear guard followed along behind the ark blowing rams' horns.

The seven priests carrying the seven rams' horns before the ark of the Lord marched along blowing their horns. Armed troops marched ahead of them, while the rear guard followed along behind the ark of the Lord blowing rams' horns.

The army was in position -- the main army north of the city and the rear guard west of the city. That night Joshua went into the middle of the valley.

Yet do not depart quickly or leave in a panic. For the Lord goes before you; the God of Israel is your rear guard.

Then your light will shine like the sunrise; your restoration will quickly arrive; your godly behavior will go before you, and the Lord's splendor will be your rear guard.