After forcing the pass beneath the Golden Tooth, Ser Jaime Lannister marched his host to Riverrun, the seat of House Tully at the meeting of the rivers. Lord Hoster Tully lay abed and dying, and it fell to his son and heir, Ser Edmure Tully, to lead out the river knights against the invader. Edmure gave battle before the walls of his own castle and was soundly beaten; his host was broken and driven back within the gates, and a number of the river lords were taken captive in the fighting.
Having mastered the Tullys in the field, Jaime settled to the work of the siege. He threw up three great fortified camps about Riverrun, one on each side of the rivers, joined by pontoon bridges of boats so that no part of his host could be cut off and no relief could come to the castle by land or water. Penned within their walls, the Tullys could only wait, and the golden lions held the heart of the riverlands in their grip. There the siege remained through the season, an anvil upon which Tywin Lannister meant to break the river lords, until Robb Stark came down out of the north and west and fell upon the leaderless Lannister camps at the Battle of the Camps, lifting the siege and freeing Riverrun.