The Emperor was only supported by the Count of Tyrol, by Frederick of Hohenzollern and a few bishops, but he procured the alliance of the Hungarians, and then marched against Ottokar with a much inferior force. Nevertheless, he was completely victorious in the battle which took place, on the river March, in August, 1278. Ottokar was killed, and his Saxon and Bavarian allies scattered. Rudolf used his victory with a moderation which secured him new advantages. He married one of his daughters to Wenzel, Ottokar's son, and allowed him the crown of Bohemia and Moravia; he gave Carinthia to the Count of Tyrol, and Austria and Styria to his own sons, Rudolf and Albert. Towards the other German princes he was so conciliatory and forbearing that they found no cause for further opposition. Thus the influence of the House of Hapsburg was permanently founded, and--curiously enough, when we consider the later history of Germany--chiefly by the help of the founder of the House of Hohenzollern. [Sidenote: 1285. RUDOLF'S SUCCESSES.] After spending five years in Austria, and securing the results of his victory, Rudolf returned to the interior of Germany. A Diet held at Augsburg in 1282 confirmed his sons in their new sovereignties, and his authority as German Emperor was thenceforth never seriously opposed. He exerted all his influence over the princes in endeavoring to settle the numberless disputes which arose out of the law by which the territory and rule of the father were divided among many sons,--or, in case there were no direct heirs, which gave more than one relative an equal claim. He proclaimed a National Peace, or cessation of quarrels between the States, and thereby accomplished some good, although the order was only partially obeyed. At a Diet which he held in Erfurt, he urged the strongest measures for the suppression of knightly robbery. Sixty castles of the noble highwaymen were razed to the ground, and more than thirty of the titled vagabonds expiated their crimes on the scaffold. In all the measures which he undertook for the general welfare of the country he succeeded as far as was possible at such a time. In his schemes of personal ambition, however, the Emperor was not so successful. His attempt to make his eldest son Duke of Suabia failed completely. Then in order to establish a right to Burgundy, he married, at the age of sixty-six, the sister of Count Robert, a girl of only fourteen. Although he gained some few advantages in Western Switzerland, he was resisted by the city of Berne, and all he accomplished in the end was the stirring up of a new hostility to Germany and a new friendship for France throughout the whole of Burgundy. On the eastern frontier, however, the Empire was enlarged by the voluntary annexation of Silesia to Bohemia, in exchange for protection against the claims of Poland.