Gustavus Adolphus had flattered him with the promise of the Duchy of Franconia, to be formed out of the Bishoprics of Wurtzburg and Bamberg, and he now insisted on the performance of this pledge. He at the same time demanded the chief command, as generalissimo of Sweden. The abuse which the Duke of Weimar thus made of his influence, so irritated Oxenstiern, that, in the first moment of his displeasure, he gave him his dismissal from the Swedish service. But he soon thought better of it, and determined, instead of sacrificing so important a leader, to attach him to the Swedish interests at any cost. He therefore granted to him the Franconian bishoprics, as a fief of the Swedish crown, reserving, however, the two fortresses of Wurtzburg and Koenigshofen, which were to be garrisoned by the Swedes; and also engaged, in name of the Swedish crown, to secure these territories to the duke. His demand of the supreme authority was evaded on some specious pretext. The duke did not delay to display his gratitude for this valuable grant, and by his influence and activity soon restored tranquillity to the army. Large sums of money, and still more extensive estates, were divided among the officers, amounting in value to about five millions of dollars, and to which they had no other right but that of conquest. In the mean time, however, the opportunity for a great undertaking had been lost, and the united generals divided their forces to oppose the enemy in other quarters. Gustavus Horn, after a short inroad into the Upper Palatinate, and the capture of Neumark, directed his march towards the Swabian frontier, where the Imperialists, strongly reinforced, threatened Wuertemberg. At his approach, the enemy retired to the Lake of Constance, but only to show the Swedes the road into a district hitherto unvisited by war. A post on the entrance to Switzerland, would be highly serviceable to the Swedes, and the town of Kostnitz seemed peculiarly well fitted to be a point of communication between him and the confederated cantons. Accordingly, Gustavus Horn immediately commenced the siege of it; but destitute of artillery, for which he was obliged to send to Wirtemberg, he could not press the attack with sufficient vigour, to prevent the enemy from throwing supplies into the town, which the lake afforded them convenient opportunity of doing. He, therefore, after an ineffectual attempt, quitted the place and its neighbourhood, and hastened to meet a more threatening danger upon the Danube.