Sherrer is a village with a stone holdfast in the riverlands, downriver from Mummer's Ford on the Red Fork. The village may be under the dominion of House Vance of Wayfarer's Rest, as Ser Karyl Vance reports on its status to the Iron Throne.
A Game of Thrones
At the beginning of the War of the Five Kings, the population of Sherrer is decimated, and their houses burned by Lannister men-at-arms posing as brigands. The people find shelter in the stone holdfast of the village, and the raiders consider setting a fire to smoke them out, before deciding to attack Mummer's Ford instead.
Afterwards, the surviving villagers are brought to King's Landing by Ser Karyl Vance, Ser Raymun Darry, and Ser Marq Piper, as witnesses against the raiders. The former owner of the destroyed alehouse, Joss, tells of the attack to the Hand of the King, Lord Eddard Stark, and his story is corroborated by an old man who used to work in Ser Willum's stables. In response, Eddard sends a force led by Lord Beric Dondarrion to bring Ser Gregor Clegane to justice.
A Storm of Swords
The Mad Huntsman accuses Sandor Clegane of crimes against the population of Sherrer, stating that girls of six and seven were raped and babies were killed. Sandor replies that he was not at Sherrer, nor at the Mummer's Ford.