'Skulls' in the Bible

I see him, but not now; I behold him, but not close at hand. A star will march forth out of Jacob, and a scepter will rise out of Israel. He will crush the skulls of Moab, and the heads of all the sons of Sheth.

Even the soldiers from Memphis and Tahpanhes have cracked your skulls, people of Israel.

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.