Albrecht was dissatisfied with the results of the last truce, and renewed the hostilities in the spring of 1353. Prevailing on Charles IV. to intervene that monarch twice visited Zurich, and held interviews with her representatives, and those of the Waldstätten. Yet it was evident his purpose was to give every advantage to Austria. The citizens trusting that his mediation would be just, received him with "imposing pomp and great honours." But their high hopes were soon dashed. Influenced by the Austrian counsellors about him, Charles strongly upheld the old Habsburg claims, and on his second visit even denied the validity of the ancient charters of the Forest, and requested the Eidgenossen to dissolve their union. Naturally, the Confederates were unwilling to throw away the results of a century's hard struggling, and, insisting on their unchangeable and undeniable rights, they simply answered that his "views were incomprehensible to them." Charles at once returned to Nürnberg, and thence sent to Zurich his declaration of war. Albrecht, who had bought and rebuilt Rapperswyl, assembled there his forces, and laid waste the borders of the lake. The king fixed his camp at Regensberg; and thence the two pushed forward and formed a junction at Küsnacht. Their united forces, estimated at fifty thousand, formed the most formidable and magnificent army seen that century. Ravaging the lovely vineyard slopes, laments a contemporary annalist, they marched on Zurich, and, in spite of the sallies of the Zurcher to avert such a fate, completely encircled the town. Entirely cut off from all supplies, the inhabitants had no hope of holding out for any length of time, especially against a foe ten times more numerous. But at the most critical moment the place was saved by a stratagem. For suddenly the imperial banner was seen floating over the citadel. The burgesses (or their leader Brun) had hoisted it up as a declaration that they were the subjects of the Holy Roman Empire, and meant no disobedience to the king. The incident made a deep impression on the enemy, and Charles at once suspended the siege. Thus for the third time foiled Albrecht retired in high dudgeon to Baden, and thence began to indulge in mere petty warfare. As for the king, he betook himself to Prague, there to enrich the Domkirche with the numerous relics and antiquities he had delightedly amassed during his stay in Swiss lands. This king was the founder of Bohemia's greatness, and of the splendour of its capital.