text: A force in this conflict was supported by Walter Espec, but he changed his mind after his nephew Jordan de Bussey was abandoned at the fortress of Wark.
full_question: A force in this conflict was supported by Walter Espec, but he changed his mind after his nephew Jordan de Bussey was abandoned at the fortress of Wark. Another man switched sides after his property, including Walden Castle, was seized and he was arrested. That man, Geoffrey de Mandeville, may be referenced in the eyewitness account of this conflict in the Peterbor- ough Chronicle. It saw the early victory of Archbishop Thurstan at the Battle of the Standard, while Robert of Gloucester was exchanged for a captive following the Rout of Winchester. To escape a siege on Oxford castle, a certain female walked across the frozen Thames during this conflict, which ended when the Battle of Lincoln led to signing of the Treaty of Wallingford. It was initiated by the sinking of a ship killing William Adelin, the only heir of Henry I. For 10 points, name this succession struggle between Stephen of Blois and Empress Matilda, a nineteen-year civil war in England.
first_sentence: A force in this conflict was supported by Walter Espec, but he changed his mind after his nephew Jordan de Bussey was abandoned at the fortress of Wark.
raw_answer: The Anarchy [or Nineteen-Year War or Nineteen-Year Winter until "nineteen" is read]