The Prussian possessions on the left bank of the Elbe, Hanover, Brunswick, and Hesse-Cassel,[11] were converted by Napoleon into the new kingdom of Westphalia, which he bestowed upon his brother Jerome and included in the Rhenish confederation. East Friesland was annexed to Holland. Poland was not restored, but a petty grandduchy of Warsaw was erected, which Frederick Augustus, elector of Saxony, received, together with the royal dignity. Prussia, already greatly diminished in extent, was to be still further encroached upon and watched by these new states. The example of electoral Saxony was imitated by the petty Saxon princes, and Anhalt, Lippe, Schwarzburg, Reuss, Mecklenburg and Aldenburg joined the Rhenish confederation. Dantzig became a nominal free town with a French garrison.[12] The brave Hessians resisted this fresh act of despotism. The Hessian troops revolted, but were put down by force, and their leader, a sergeant, rushed frantically into the enemy's fire. The Hessian peasantry also rose in several places. The Hanse towns, on the contrary, meekly allowed themselves to be pillaged and to be robbed of their stores of English goods. Gustavus Adolphus IV. of Sweden, who had neglected to send troops at an earlier period to the aid of Prussia, now offered the sturdiest resistance and steadily refused to negotiate terms of peace or to recognize Napoleon as emperor. His generals, Armfeldt[13] and Essen, made some successful inroads from Stralsund, and, in unison with the English, might have effected a strong diversion to Napoleon's rear, had their movements been more rapid and combined. On the conclusion of the peace of Tilsit, a French force under Mortier appeared, drove the Swedes back upon Stralsund, and compelled the king, in the August of 1807, to abandon that city, which the new system of warfare rendered no longer tenable. [Footnote 1: On the 14th of October. On this unlucky day, Frederick the Great had, in 1758, been surprised at Hochkirch, and Mack, in 1805, at Ulm. On this day, the peace of Westphalia was, A.D. 1648, concluded at Osnabrück, and, in 1809, that of Vienna. It was, however, on this day that the siege of Vienna was, in 1529, raised, and that, in 1813, Napoleon was shut up at Leipzig.] [Footnote 2: The whole of these disasters had been predicted by Henry von Bülow, whose prophecies had brought him into a prison. On learning the catastrophe of Jena, he exclaimed, "That is the consequence of throwing generals into prison and of placing idiots at the head of the army!"]