'Rear guard' in the Bible

And the armed men went before the priests who blew with the trumpets, and the rearguard came after the ark; they blew with the trumpets in marching.

And the seven priests carrying the seven blast-trumpets before the ark of Jehovah went on and blew continually with the trumpets; and the armed men went before them, and the rearguard went after the ark of Jehovah; they blew with the trumpets in marching.