 In the same month, Maximilian ordered Tilly to move his troops into Lower Saxony, and Wallenstein invaded the Archbishopric of Magdeburg and the Bishopric of Halberstadt, but a fierce rivalry between the two commanders prevented them from continuing the military campaign.The electors of Mainz and Saxony demanded that Ferdinand should convoke the electors to a new convention to discuss the status of the Palatinate, but Ferdinand adopted a delaying tactic.In a letter, he informed Maximilian of Bavaria about his plan to grant a pardon to Frederick V in exchange for Frederick's public submission and an indemnification for the costs of the war, but he also emphasized that he did not want to deprive Maximilian of the electoral title.