The Sejm refuses to allow the mobilization of more troops

Since the issuing of the Henrykian Articles and the Pacta Conventa the King had very little power of his own. If he was to make policies, of war for example, he had to have the consent of the Sejm. Sometimes kings tried to drag the country into conflict and thus force the Sejm to comply out of necessity or by building a domestic political coalition which were changing tit for tat. But often the Sejm plainly said no.