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.
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.
Gustavus Adolphus now conveyed his artillery and the greater part of his troops over the river, and laid siege to Oppenheim, which, after a brave resistance, was, on the 8th December, 1631, carried by storm. Five hundred Spaniards, who had so courageously defended the place, fell indiscriminately a sacrifice to the fury of the Swedes. The crossing of the Rhine by Gustavus struck terror into the Spaniards and Lorrainers, who had thought themselves protected by the river from the vengeance of the Swedes. Rapid flight was now their only security; every place incapable of an effectual defence was immediately abandoned. After a long train of outrages on the defenceless citizens, the troops of Lorraine evacuated Worms, which, before their departure, they treated with wanton cruelty. The Spaniards hastened to shut themselves up in Frankenthal, where they hoped to defy the victorious arms of Gustavus Adolphus.
The king lost no time in prosecuting his designs against Mentz, into which the flower of the Spanish troops had thrown themselves. While he advanced on the left bank of the Rhine, the Landgrave of Hesse Cassel moved forward on the other, reducing several strong places on his march. The besieged Spaniards, though hemmed in on both sides, displayed at first a bold determination, and threw, for several days, a shower of bombs into the Swedish camp, which cost the king many of his bravest soldiers. But notwithstanding, the Swedes continually gained ground, and had at last advanced so close to the ditch that they prepared seriously for storming the place. The courage of the besieged now began to droop. They trembled before the furious impetuosity of the Swedish soldiers, of which Marienberg, in Wurtzburg, had afforded so fearful an example. The same dreadful fate awaited Mentz, if taken by storm; and the enemy might even be easily tempted to revenge the carnage of Magdeburg on this rich and magnificent residence of a Roman Catholic prince. To save the town, rather than their own lives, the Spanish garrison capitulated on the fourth day, and obtained from the magnanimity of Gustavus a safe conduct to Luxembourg; the greater part of them, however, following the example of many others, enlisted in the service of Sweden.
On the 13th December, 1631, the king made his entry into the conquered town, and fixed his quarters in the palace of the Elector. Eighty pieces of cannon fell i
nto his hands, and the citizens were obliged to redeem their property from pillage, by a payment of 80,000 florins. The benefits of this redemption did not extend to the Jews and the clergy, who were obliged to make large and separate contributions for themselves. The library of the Elector was seized by the king as his share, and presented by him to his chancellor, Oxenstiern, who intended it for the Academy of Westerrah, but the vessel in which it was shipped to Sweden foundered at sea.
After the loss of Mentz, misfortune still pursued the Spaniards on the Rhine. Shortly before the capture of that city, the Landgrave of Hesse Cassel had taken Falkenstein and Reifenberg, and the fortress of Koningstein surrendered to the Hessians. The Rhinegrave, Otto Louis, one of the king's generals, defeated nine Spanish squadrons who were on their march for Frankenthal, and made himself master of the most important towns upon the Rhine, from Boppart to Bacharach. After the capture of the fortress of Braunfels, which was effected by the Count of Wetterau, with the co-operation of the Swedes, the Spaniards quickly lost every place in Wetterau, while in the Palatinate they retained few places besides Frankenthal. Landau and Kronweisenberg openly declared for the Swedes; Spires offered troops for the king's service; Manheim was gained through the prudence of the Duke Bernard of Weimar, and the negligence of its governor, who, for this misconduct, was tried before the council of war, at Heidelberg, and beheaded.
The king had protracted the campaign into the depth of winter, and the severity of the season was perhaps one cause of the advantage his soldiers gained over those of the enemy. But the exhausted troops now stood in need of the repose of winter quarters, which, after the surrender of Mentz, Gustavus assigned to them, in its neighbourhood. He himself employed the interval of inactivity in the field, which the season of the year enjoined, in arranging, with his chancellor, the affairs of his cabinet, in treating for a neutrality with some of his enemies, and adjusting some political disputes which had sprung up with a neighbouring ally. He chose the city of Mentz for his winter quarters, and the settlement of these state affairs, and showed a greater partiality for this town, than seemed consistent with the interests of the German princes, or the shortness of his visit to the Empire. Not content with strongly fortifying it, he erected at the opposite angle which the Maine forms with the Rhine, a new citadel, which was named Gustavusburg from its founder, but which is better known under the title of Pfaffenraub or Pfaffenzwang*.
-- * Priests' plunder; alluding to the means by which the expense of its erection had been defrayed. --
While Gustavus Adolphus made himself master of the Rhine, and threatened the three neighbouring electorates with his victorious arms, his vigilant enemies in Paris and St. Germain's made use of every artifice to deprive him of the support of France, and, if possible, to involve him in a war with that power. By his sudden and equivocal march to the Rhine, he had surprised his friends, and furnished his enemies with the means of exciting a distrust of his intentions. After the conquest of Wurtzburg, and of the greater part of Franconia, the road into Bavaria and Austria lay open to him through Bamberg and the Upper Palatinate; and the expectation was as general, as it was natural, that he would not delay to attack the Emperor and the Duke of Bavaria in the very centre of their power, and, by the reduction of his two principal enemies, bring the war immediately to an end. But to the surprise of both parties, Gustavus left the path which general expectation had thus marked out for him; and instead of advancing to the right, turned to the left, to make the less important and more innocent princes of the Rhine feel his power, while he gave time to his more formidable opponents to recruit their strength. Nothing but the paramount design of reinstating the unfortunate Palatine, Frederick V., in the possession of his territories, by the expulsion of the Spaniards, could seem to account for this strange step; and the belief that Gustavus was about to effect that restoration, silenced for a while the suspicions of his friends and the calumnies of his enemies. But the Lower Palatinate was now almost entirely cleared of the enemy; and yet Gustavus continued to form new schemes of conquest on the Rhine, and to withhold the reconquered country from the Palatine, its rightful owner. In vain did the English ambassador remind him of what justice demanded, and what his own solemn engagement made a duty of honour; Gustavus replied to these demands with bitter complaints of the inactivity of the English court, and prepared to carry his victorious standard into Alsace, and even into Lorraine.
A distrust of the Swedish monarch was now loud and open, while the malice of his enemies busily circulated the most injurious reports as to his intentions. Richelieu, the minister of Louis XIII., had long witnessed with anxiety the king's progress towards the French frontier, and the suspicious temper of Louis rendered him but too accessible to the evil surmises which the occasion gave rise to. France was at this time involved in a civil war with her Protestant subjects, and the fear was not altogether groundless, that the approach of a victorious monarch of their party might revive their drooping spirit, and encourage them to a more desperate resistance. This might be the case, even if Gustavus Adolphus was far from showing a disposition to encourage them, or to act unfaithfully towards his ally, the King of France. But the vindictive Bishop of Wurtzburg, who was anxious to avenge the loss of his dominions, the envenomed rhetoric of the Jesuits and the active zeal of the Bavarian minister, represented this dreaded alliance between the Huguenots and the Swedes as an undoubted fact, and filled the timid mind of Louis with the most alarming fears. Not merely chimerical politicians, but many of the best informed Roman Catholics, fully believed that the king was on the point of breaking into the heart of France, to make common cause with the Huguenots, and to overturn the Catholic religion within the kingdom. Fanatical zealots already saw him, with his army, crossing the Alps, and dethroning the Viceregent of Christ in Italy. Such reports no doubt soon refute themselves; yet it cannot be denied that Gustavus, by his manoeuvres on the Rhine, gave a dangerous handle to the malice of his enemies, and in some measure justified the suspicion that he directed his arms, not so much against the Emperor and the Duke of Bavaria, as against the Roman Catholic religion itself.
The general clamour of discontent which the Jesuits raised in all the Catholic courts, against the alliance between France and the enemy of the church, at last compelled Cardinal Richelieu to take a decisive step for the security of his religion, and at once to convince the Roman Catholic world of the zeal of France, and of the selfish policy of the ecclesiastical states of Germany. Convinced that the views of the King of Sweden, like his own, aimed solely at the humiliation of the power of Austria, he hesitated not to promise to the princes of the League, on the part of Sweden, a complete neutrality, immediately they abandoned their alliance with the Emperor and withdrew their troops. Whatever the resolution these princes should adopt, Richelieu would equally attain his object. By their separation from the Austrian interest, Ferdinand would be exposed to the combined attack of France and Sweden; and Gustavus Adolphus, freed from his other enemies in Germany, would be able to direct his undivided force against the hereditary dominions of Austria. In that event, the fall of Austria was inevitable, and this great object of Richelieu's policy would be gained without injury to the church. If, on the other hand, the princes of the League persisted in their opposition, and adhered to the Austrian alliance, the result would indeed be more doubtful, but still France would have sufficiently proved to all Europe the sincerity of her attachment to the Catholic cause, and performed her duty as a member of the Roman Church. The princes of the League would then appear the sole authors of those evils, which the continuance of the war would unavoidably bring upon the Roman Catholics of Germany; they alone, by their wilful and obstinate adherence to the Emperor, would frustrate the measures employed for their protection, involve the church in danger, and themselves in ruin.
Richelieu pursued this plan with greater zeal, the more he was embarrassed by the repeated demands of the Elector of Bavaria for assistance from France; for this prince, as already stated, when he first beg
an to entertain suspicions of the Emperor, entered immediately into a secret alliance with France, by which, in the event of any change in the Emperor's sentiments, he hoped to secure the possession of the Palatinate. But though the origin of the treaty clearly showed against what enemy it was directed, Maximilian now thought proper to make use of it against the King of Sweden, and did not hesitate to demand from France that assistance against her ally, which she had simply promised against Austria. Richelieu, embarrassed by this conflicting alliance with two hostile powers, had no resource left but to endeavour to put a speedy termination to their hostilities; and as little inclined to sacrifice Bavaria, as he was disabled, by his treaty with Sweden, from assisting it, he set himself, with all diligence, to bring about a neutrality, as the only means of fulfilling his obligations to both. For this purpose, the Marquis of Breze was sent, as his plenipotentiary, to the King of Sweden at Mentz, to learn his sentiments on this point, and to procure from him favourable conditions for the allied princes. But if Louis XIII. had powerful motives for wishing for this neutrality, Gustavus Adolphus had as grave reasons for desiring the contrary. Convinced by numerous proofs that the hatred of the princes of the League to the Protestant religion was invincible, their aversion to the foreign power of the Swedes inextinguishable, and their attachment to the House of Austria irrevocable, he apprehended less danger from their open hostility, than from a neutrality which was so little in unison with their real inclinations; and, moreover, as he was constrained to carry on the war in Germany at the expense of the enemy, he manifestly sustained great loss if he diminished their number without increasing that of his friends. It was not surprising, therefore, if Gustavus evinced little inclination to purchase the neutrality of the League, by which he was likely to gain so little, at the expense of the advantages he had already obtained.
History of the Thirty Years' War in Germany. Page 22