'Shadows' in the Bible

Prepare ye war against her; arise, and let us go up at noon. Woe unto us! for the day goeth away, for the shadows of the evening are stretched out.

In the shadows of the walls of Heshbon those trying to escape will stand helpless. For a fire will burst forth from Heshbon. Flames will shoot out from the former territory of Sihon. They will burn the foreheads of the people of Moab, the skulls of those war-loving people.