The Surrender of the Crag is an event in the War of the Five Kings. It occurs off screen between "A Man Without Honor" and "The Prince of Winterfell." The army of House Stark in the Westerlands maintains its camp after the victory at the Battle of the Yellow Fork while King Robb Stark travels to the Crag with a small force to negotiate their surrender and take on supplies.
Having won victories in the Riverlands, at the Battle of Oxcross and the Battle of the Yellow Fork the army of House Stark under the command of King Robb I has established a strong foothold in the Westerlands. The victory at Oxcross has left the region lightly defended.
King Robb Stark leads part of his force to the Crag to negotiate the surrender of House Westerling, a vassal house of his enemies House Lannister. He is accompanied by the battlefield surgeon Talisa Maegyr who uses the opportunity to obtain supplies from the castle's Maester.
Robb returns from the mission without incident. However, while he was away his key prisoner Ser Jaime Lannister was released by his mother Catelyn Stark without his consent. The betrayal, combined with the ongoing worry about his siblings captivity, causes Robb to seek solace in the arms of Talisa Maegyr, flaunting his vow to marry into House Frey.
In the books
In the A Song of Ice and Fire, novels the Crag surrenders only after losing a battle for control of the castle. Robb is wounded in the battle and shortly afterwards learns of the apparent deaths of his brothers at the hand of Theon Greyjoy. It is this different betrayal that causes him to seek solace in the arms of a woman despite his betrothal, in this case Jeyne Westerling rather than Talisa Maegyr.
- Battle of the Crag at A Wiki of Ice and Fire (MAJOR spoilers from the books)