The populace of Vienna, espousing the cause of Albert, rose in insurrection, pillaged the houses of the adherents of Frederic, drove Frederic, with his wife and infant child, into the citadel, and invested the fortress.
Albert placed himself at the head of the insurgents and conducted the siege.

The emperor, though he had but two hundred men in the garrison, held out valiantly.

But famine would soon have compelled him to capitulate, had not the King of Bohemia, with a force of thirteen thousand men, marched to his aid.

Podiebrad relieved the emperor, and secured a verbal reconciliation between the two angry brothers, which lasted until the Bohemian forces had returned to their country, when the feud burst out anew and with increased violence.

The emperor procured the ban of the empire against his brother, and the pope excommunicated him.