'Sound of the Trumpet' in the Bible

When they sound a long blast with the ram's horn, as soon as you hear the sound of the trumpet, then the entire army is to cry out loud, the city wall will collapse, and then all of the soldiers are to charge straight ahead."

So the army shouted and the trumpets were blown again. As soon as the army heard the sound of the trumpets, they shouted loudly and the wall collapsed. The army charged straight ahead into the city and captured it.