Saxony was put under Russian occupation and 40 % of the Kingdom , including the historically significant Wittenberg , home of the Protestant Reformation , was taken by Prussia , but Frederick Augustus was allowed back to rule the remainder of his kingdom , which still included the major cities of Dresden and Leipzig . In the end , 40 % of the Kingdom , including the historically significant Wittenberg , home of the Protestant Reformation , was annexed by Prussia , but Frederick Augustus was restored to the throne in the remainder of his kingdom , which still included the major cities of Dresden and Leipzig .