Nehemiah 4:18-21

As for the builders, each wore his sword girded at his side as he built, while the trumpeter stood near me. I said to the nobles, the officials and the rest of the people, “The work is great and extensive, and we are separated on the wall far from one another. At whatever place you hear the sound of the trumpet, rally to us there. Our God will fight for us.” So we carried on the work with half of them holding spears from dawn until the stars appeared.