But great as the advantages were, which Frederick had promised himself from the power and good fortune of his protector; and high as were the expectations he had built on his justice and magnanimity, the chance of this unfortunate prince's reinstatement in his kingdom was as distant as ever. The inactivity and contradictory politics of the English court had abated the zeal of Gustavus Adolphus, and an irritability which he could not always repress, made him on this occasion forget the glorious vocation of protector of the oppressed, in which, on his invasion of Germany, he had so loudly announced himself.
The terrors of the king's irresistible strength, and the near prospect of his vengeance, had also compelled George, Landgrave of Hesse Darmstadt, to a timely submission. His connection with the Emperor, and his indifference to the Protestant cause, were no secret to the king, but he was satisfied with laughing at so impotent an enemy.
As the Landgrave knew his own strength and the political situation of Germany so little, as to offer himself as mediator between the contending parties, Gustavus used jestingly to call him the peacemaker. He was frequently heard to say, when at play he was winning from the Landgrave, "that the money afforded double satisfaction, as it was Imperial coin."To his affinity with the Elector of Saxony, whom Gustavus had cause to treat with forbearance, the Landgrave was indebted for the favourable terms he obtained from the king, who contented himself with the surrender of his fortress of Russelheim, and his promise of observing a strict neutrality during the war. The Counts of Westerwald and Wetteran also visited the King in Frankfort, to offer him their assistance against the Spaniards, and to conclude an alliance, which was afterwards of great service to him.
The town of Frankfort itself had reason to rejoice at the presence of this monarch, who took their commerce under his protection, and by the most effectual measures restored the fairs, which had been greatly interrupted by the war.
The Swedish army was now reinforced by ten thousand Hessians, which the Landgrave of Casse commanded. Gustavus Adolphus had already invested Koenigstein; Kostheim and Floersheim surrendered after a short siege; he was in command of the Maine; and transports were preparing with all speed at Hoechst to carry his troops across the Rhine.
These preparations filled the Elector of Mentz, Anselm Casimir, with consternation; and he no longer doubted but that the storm of war would next fall upon him. As a partisan of the Emperor, and one of the most active members of the League, he could expect no better treatment than his confederates, the Bishops of Wurtzburg and Bamberg, had already experienced. The situation of his territories upon the Rhine made it necessary for the enemy to secure them, while the fertility afforded an irresistible temptation to a necessitous army.
Miscalculating his own strength and that of his adversaries, the Elector flattered himself that he was able to repel force by force, and weary out the valour of the Swedes by the strength of his fortresses.
He ordered the fortifications of his capital to be repaired with all diligence, provided it with every necessary for sustaining a long siege, and received into the town a garrison of 2,000 Spaniards, under Don Philip de Sylva. To prevent the approach of the Swedish transports, he endeavoured to close the mouth of the Maine by driving piles, and sinking large heaps of stones and vessels. He himself, however, accompanied by the Bishop of Worms, and carrying with him his most precious effects, took refuge in Cologne, and abandoned his capital and territories to the rapacity of a tyrannical garrison.
But these preparations, which bespoke less of true courage than of weak and overweening confidence, did not prevent the Swedes from marching against Mentz, and making serious preparations for an attack upon the city. While one body of their troops poured into the Rheingau, routed the Spaniards who remained there, and levied contributions on the inhabitants, another laid the Roman Catholic towns in Westerwald and Wetterau under similar contributions. The main army had encamped at Cassel, opposite Mentz; and Bernhard, Duke of Weimar, made himself master of the Maeusethurm and the Castle of Ehrenfels, on the other side of the Rhine. Gustavus was now actively preparing to cross the river, and to blockade the town on the land side, when the movements of Tilly in Franconia suddenly called him from the siege, and obtained for the Elector a short repose.
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.
