Who did it?

The utter destruction of the city [Ur] was wrought, in our terms, by the barbaric hordes which attacked it. Not so in terms of the Mesopotamian's own understanding of his universe: the wild destructive essence manifest in this attack was Enlil’s. The enemy hordes were but a cloak, an outward form under which that essence realized itself. In a deeper, truer sense the barbaric hordes were a storm, Enlil's storm, wherewith the god himself was executing a verdict passed on Ur and its people by the assembly of the gods; and as that storm the enemy attack is seen and described.—Bertil Albrektson, History and the Gods: An Essay on the Idea of Historical Events as Divine Manifestations in the Ancient Near East and in Israel, 28