In the meantime, the indefatigable Burggraf of Nürnberg had discovered and fomented the discontents of the nobles of Austria and Styria; and he announced to Ottakar that the Ban of the Empire had been proclaimed against him. But even now Ottakar was unaware of Rudolf’s plans; he probably despised his military ability; and he thought it sufficient to send a small force to the defence of the Bohemian frontier, while he gave himself up to hunting and other amusements. He was, therefore, terribly startled when, in September, 1276, Rudolf suddenly entered Austria. Almost at the same time Count Meinhard invaded Carinthia, and the Styrian nobles, rising in insurrection, drove out Milota from their country. Still Ottakar hoped to save himself by the devotion of the towns; for six months, Vienna justified his expectations by holding out against Rudolf’s army; and Paltram, the Burgomaster, roused the citizens to a vigorous defence on behalf of the King, who had showed them such favour. Ottakar, now stirred to action, marched into Austria and occupied one side of the Danube; from whence he hoped to make an attack on the rear of Rudolf’s army. But the Count Palatine of the Rhine hastened to seize the fortresses which lay between him and the German army; and it was now that Ottakar became thoroughly aware of the defection of his nobles. Fortress after fortress surrendered to Rudolf without a struggle; and at last the poorer men in Vienna, seeing the continual destruction of their vineyards outside the city, called upon Paltram to surrender. He, finding that Ottakar did not arrive, despaired of holding out longer; though, before surrendering, he exacted from Rudolf a promise that he would maintain the liberties of Vienna.