'Flat' in the Bible

And when they blow long on the horn of the ram, when you hear the sound of the trumpet, all the people will shout [with] a great war cry, and the wall of the city will fall flat, and {the people will charge, each one straight ahead}."

So the people shouted, and they blew on the trumpets. And when the people heard the sound of the trumpet, they raised a great shout, and the wall fell flat. {The people charged, each one straight ahead into the city}, and they captured it.