Siege of Riverrun

"Jaime smashed the Riverlords at Golden Tooth, and now lays siege on Riverrun."

- Ser Kevan Lannister

The Siege of Riverrun is a military engagement in Game of Thrones. It was one of the opening battles in the War of the Five Kings, which erupted after the death of King Robert Baratheon. It is mentioned in the eighth episode of the first season of Game of Thrones.

Season 1
After defeating the Riverlords at Golden Tooth. a Lannister host led by Ser Jaime Lannister pushes into the Riverlands to lay siege to Riverrun, ancestral seat of House Tully.

The Lannister host keeps laying siege on Riverrun until Jaime's host is lured away and defeated in the Battle of the Whispering Wood, while the remaining Lannister force at the Battle of the Camps.

In the books
In the A Song of Ice and Fire novels, after his victory at Golden Tooth. Jaime Lannister pushes into the Riverlands, though Ser Edmure Tully assembles a host to defend his family seat. He's defeated, however, and taken hostage along with several other Riverlords, while Lord Tytos Blackwood manages to escape, take refuge in Riverrun and resists until the castle is finally liberated at the Battle of the Camps.