'Rear guard' in the Bible

And the standard of the camp of the sons of Dan set forward, the rear guard of all the camps throughout their army. And over his army was Ahiezer the son of Ammishaddai.

And seven priests carrying seven ram's horns before the ark of Jehovah went on without stopping and blew with the ram's horns. And the armed men went in front of them. But the rear guard came after the ark of Jehovah as the priests were going on and blowing with the ram's horns.