William, duke of Brunswick, the son of the hapless Duke Ferdinand, had quitted Oels, his sole possession, for Bohemia, where he had collected a force two thousand strong, known as the black Brunswickers on account of the color of their uniform and the death's head on their helmets, with which he resolved to avenge his father's death. Victorious in petty engagements over the Saxons at Zittau and over the French under Junot at Berneck, he refused to recognize the armistice between Austria and France, and, fighting his way through the enemy, surprised Leipzig by night and there provided himself with ammunition and stores. He was awaited at Halberstadt by the Westphalians under Wellingerode, whom, notwithstanding their numerical superiority, he completely defeated during the night of the 30th of July. Two days later he was attacked in Brunswick, in his father's home, by an enemy three times his superior, by the Westphalians under Rewbel, who advanced from Celle while the Saxons and Dutch pursued him from Erfurt. Aided by his brave citizens, many of whom followed his fortunes, he was again victorious and was enabled by a speedy retreat, in which he broke down all the bridges to his rear, to escape to Elsfleth, whence he sailed to England. In August, an English army, forty thousand strong, landed on the island of Walcheren and attempted to create a diversion in Holland, but its ranks were speedily thinned by disease, it did not venture up the country and finally returned to England. The English, nevertheless, displayed henceforward immense activity in the Peninsula, where, aided by the brave and high-spirited population,[13] they did great detriment to the French. In the English army in the Peninsula were several thousand Germans, principally Hanoverian refugees. There were also numerous deserters from the Rhenish confederated troops, sent by Napoleon into Spain. During the war in June, the king of Wurtemberg took possession of Mergentheim, the chief seat of the Teutonic order, which had, up to the present period, remained unsecularized. The surprised inhabitants received the new Protestant authorities with demonstrations of rage and revolted. They were the last and the only ones among all the secularized or mediatized estates of the Empire that boldly attempted opposition. They were naturally overpowered without much difficulty and were cruelly punished. About thirty of them were shot by the soldiery; six were executed; several wealthy burgesses and peasants were condemned as criminals to work in chains in the new royal gardens at Stuttgard. Thus miserably terminated the celebrated Teutonic order.