The Siege of Gondor.

"Great engines crawled across the field; and in the midst was a huge ram,
great as a forest-tree a hundred feet in length, swinging on mighty chains...Grond they named it, in the memory of the Hammer of the Underworld of old." At long last, some new Return of the King images (via E3) have made it online. Looks like Gandalf the White will have his work cut out for him on the ramparts of Minas Tirith. Update: The official site releases a slew of pics too, including Aragorn in battle regalia and Sam with the light of Earendil.