with unwearied animosity for two days, the 21st and 22d of May, 1809, was for the first time completely beaten[9] and compelled to fly for refuge to the island of Lobau. The rising stream had, meanwhile, carried away the bridge, Napoleon's sole chance of escape to the opposite bank. For two days he remained on the island with his defeated troops, without provisions, and in hourly expectation of being cut to pieces; the Austrians, however, neglected to turn the opportunity to advantage and allowed the French leisure to rebuild the bridge, a work of extreme difficulty. During six weeks afterward the two armies continued to occupy their former positions under the walls of Vienna on the right and left banks of the Danube, narrowly watching each other's movements and preparing for a final struggle. The Archduke John had successfully penetrated into Italy, where he had defeated the viceroy, Eugene, at Salice and Fontana fredda. Favored by the simultaneous revolt of the Tyrolese, his success appeared certain, when the news of his brother's disaster compelled him to retreat. He withdrew into Hungary,[10] whither he was pursued by Eugene, by whom he was, on the 14th of June, defeated at Raab. The Archduke Ferdinand, who had advanced as far as Warsaw, had been driven back by the Poles under Poniatowski and by a Russian force sent by the emperor Alexander to their aid, which, on this success, invaded Galicia. Napoleon rewarded the Poles for their aid by allowing Russia to seize Wallachia and Moldavia.