Henry I the Bearded
The war broke again by the end of 1235, when Władysław Odonic (using the unrest caused by the brutal government in Śrem of the Governor appointed by Henry I the Bearded, Prince Borzivoj of Bohemia), deceitfully tried to recover that part of Greater Poland. The expedition ended with some success (Śrem was recovered and Borzivoj killed during the battle); however, a retaliatory expedition of the Silesian army soon arrived at Gniezno.