 However, though he had Adalbert imprisoned at Trifels Castle and forced Lothair to submit himself after a court hearing at the Imperial Palace of Goslar, the smouldering Saxon conflict broke out again in March 1113 over the succession in the Thuringian territories left by late Count Ulric II of Weimar and Orlamünde.In order to create a base of power of his own, Henry had made attempts to confiscate the county as a ceased fief but met obstinate resistance by Ulric's heir, the Count Palatine of the Rhine Siegfried, son of the Ascanian count Adalbert II of Ballenstedt.The insurgents gathered under the lead of the Osterland count Wiprecht of Groitzsch and the Thuringian count Louis the Springer, but were repulsed by Henry's troops under Mansfeld in a battle at Warnstedt near Thale.