The Second Siege of Riverrun is a siege during the War of the Five Kings. Granted to House Frey after the downfall of House Tully at the Red Wedding, Riverrun was eventually recaptured by Ser Brynden Tully "the Blackfish" and an assembled force of Tully loyalists. House Frey launched an attempt to retake the castle which was met with failure until reinforcements of House Lannister arrived from the south. This army group, commanded by Ser Jaime Lannister in the name of King Tommen I, successfully took back Riverrun with the only casualty being that of the Blackfish himself.