Acorn Hall enters the account of the war as a point of resistance on the westermen’s march toward Harrenhal. Its significance lies in a short-lived local stand that gave the riverlords an opportunity to regroup, but did not halt the Lannister advance.

The Westermen’s Advance

As King’s Landing fell to Rhaenyra Targaryen, Prince Aemond and Criston Cole were advancing on Harrenhal, while the Lannister host under Adrian Tarbeck moved east. At Acorn Hall, Lord Joseth Smallwood sallied forth to join Lord Piper and the remnants of Piper’s defeated force. The westermen were checked briefly, and a battle followed.

The Battle at Acorn Hall

Lord Piper died in the fighting. Mushroom gives a specific account of his death: he says Piper’s heart burst when he saw his favorite grandson’s head displayed on a spear. Smallwood, meanwhile, fell back inside Acorn Hall. The outcome was therefore a momentary interruption to the westermen’s progress, not a lasting reversal of their campaign.

The Campaign Continues

Three days later, the riverlords regrouped under Harry Penny. In the ensuing battle, Penny died while slaying Adrian Tarbeck, but the Lannisters again prevailed, routing the riverlords as they fled. The western host resumed its march toward Harrenhal under the aged Humfrey Lefford, who commanded from a litter because of his many wounds. After nineteen days on the march, Criston Cole’s force reached Harrenhal and found its gates open and Prince Daemon gone. Acorn Hall thus marks one episode in a sequence of costly riverland resistance that failed to prevent the westermen from pressing on toward their objective.