Following Lord Greatjon Umber's death, Rickon and Osha are betrayed by Greatjon's heir Smalljon and handed over to the new Warden of the North, Ramsay Bolton, in order to secure an alliance with the Boltons against the wildlings Jon Snow has let through the Wall. To prove Rickon's identity, Smalljon kills Shaggydog and presents his head to Ramsay. Ramsay kills Osha, locks Rickon in the dungeons, and sends a letter to Jon at Castle Black demanding the return of Sansa Stark (his wife) and threatening to kill Rickon if Jon does not comply. In retaliation, Jon gathers an army of Stark loyalists and marches on Winterfell, now occupied by House Bolton.