The danger of Nuremberg, which, during the absence of Gustavus Adolphus on the Rhine, Tilly had made a show of besieging, and, in the event of resistance, threatened with the cruel fate of Magdeburg, occasioned the king suddenly to retire from before Mentz. Lest he should expose himself a second time to the reproaches of Germany, and the disgrace of abandoning a confederate city to a ferocious enemy, he hastened to its relief by forced marches. On his arrival at Frankfort, however, he heard of its spirited resistance, and of the retreat of Tilly, and lost not a moment in prosecuting his designs against Mentz. Failing in an attempt to cross the Rhine at Cassel, under the cannon of the besieged, he directed his march towards the Bergstrasse, with a view of approaching the town from an opposite quarter. Here he quickly made himself master of all the places of importance, and at Stockstadt, between Gernsheim and Oppenheim, appeared a second time upon the banks of the Rhine. The whole of the Bergstrasse was abandoned by the Spaniards, who endeavoured obstinately to defend the other bank of the river. For this purpose, they had burned or sunk all the vessels in the neighbourhood, and arranged a formidable force on the banks, in case the king should attempt the passage at that place. On this occasion, the king's impetuosity exposed him to great danger of falling into the hands of the enemy. In order to reconnoitre the opposite bank, he crossed the river in a small boat; he had scarcely landed when he was attacked by a party of Spanish horse, from whose hands he only saved himself by a precipitate retreat. Having at last, with the assistance of the neighbouring fishermen, succeeded in procuring a few transports, he despatched two of them across the river, bearing Count Brahe and 300 Swedes. Scarcely had this officer time to entrench himself on the opposite bank, when he was attacked by 14 squadrons of Spanish dragoons and cuirassiers. Superior as the enemy was in number, Count Brahe, with his small force, bravely defended himself, and gained time for the king to support him with fresh troops. The Spaniards at last retired with the loss of 600 men, some taking refuge in Oppenheim, and others in Mentz. A lion of marble on a high pillar, holding a naked sword in his paw, and a helmet on his head, was erected seventy years after the event, to point out to the traveller the spot where the immortal monarch crossed the great river of Germany.