'Rear guard' in the Bible

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.