Nehemiah 4:19-21

19Then I said to the nobles, the officials, and the rest of the people: “The work is great and extensive, and we are spread out far from one another along the wall. 20Wherever you hear the sound of the horn, rally to us there. Our God will fight for us!”

21So we continued the work, while half of the men held spears from the break of dawn until the stars came out.