The Thirty Years War, book 5 | Page 7

Sweden; and all that remained was to choose between them. Pride and ambition declared in favour of continuing the German war, at whatever sacrifice on the side of Poland. An army, however, was necessary to command the respect of Poland, and to give weight to Sweden in any negotiations for a truce or a peace.
The mind of Oxenstiern, firm, and inexhaustible in expedients, set itself manfully to meet these calamities, which all combined to overwhelm Sweden; and his shrewd understanding taught him how to turn even misfortunes to his advantage. The defection of so many German cities of the empire deprived him, it is true, of a great part of his former allies, but at the same time it freed him from the necessity of paying any regard to their interests. The more the number of his enemies increased, the more provinces and magazines were opened to his troops. The gross ingratitude of the States, and the haughty contempt with which the Emperor behaved, (who did not even condescend to treat directly with him about a peace,) excited in him the courage of despair, and a noble determination to maintain the struggle to the last. The continuance of war, however unfortunate it might prove, could not render the situation of Sweden worse than it now was; and if Germany was to be evacuated, it was at least better and nobler to do so sword in hand, and to yield to force rather than to fear.
In the extremity in which the Swedes were now placed by the desertion of their allies, they addressed themselves to France, who met them with the greatest encouragement. The interests of the two crowns were closely united, and France would have injured herself by allowing the Swedish power in Germany to decline. The helpless situation of the Swedes, was rather an additional motive with France to cement more closely their alliance, and to take a more active part in the German war. Since the alliance with Sweden, at Beerwald, in 1632, France had maintained the war against the Emperor, by the arms of Gustavus Adolphus, without any open or formal breach, by furnishing subsidies and increasing the number of his enemies. But alarmed at the unexpected rapidity and success of the Swedish arms, France, in anxiety to restore the balance of power, which was disturbed by the preponderance of the Swedes, seemed, for a time, to have lost sight of her original designs. She endeavoured to protect the Roman Catholic princes of the empire against the Swedish conqueror, by the treaties of neutrality, and when this plan failed, she even meditated herself to declare war against him. But no sooner had the death of Gustavus Adolphus, and the desperate situation of the Swedish affairs, dispelled this apprehension, than she returned with fresh zeal to her first design, and readily afforded in this misfortune the aid which in the hour of success she had refused. Freed from the checks which the ambition and vigilance of Gustavus Adolphus placed upon her plans of aggrandizement, France availed herself of the favourable opportunity afforded by the defeat of Nordlingen, to obtain the entire direction of the war, and to prescribe laws to those who sued for her powerful protection. The moment seemed to smile upon her boldest plans, and those which had formerly seemed chimerical, now appeared to be justified by circumstances. She now turned her whole attention to the war in Germany; and, as soon as she had secured her own private ends by a treaty with the Germans, she suddenly entered the political arena as an active and a commanding power. While the other belligerent states had been exhausting themselves in a tedious contest, France had been reserving her strength, and maintained the contest by money alone; but now, when the state of things called for more active measures, she seized the sword, and astonished Europe by the boldness and magnitude of her undertakings. At the same moment, she fitted out two fleets, and sent six different armies into the field, while she subsidized a foreign crown and several of the German princes. Animated by this powerful co-operation, the Swedes and Germans awoke from the consternation, and hoped, sword in hand, to obtain a more honourable peace than that of Prague. Abandoned by their confederates, who had been reconciled to the Emperor, they formed a still closer alliance with France, which increased her support with their growing necessities, at the same time taking a more active, although secret share in the German war, until at last, she threw off the mask altogether, and in her own name made an unequivocal declaration of war against the Emperor.
To leave Sweden at full liberty to act against Austria, France commenced her operations by liberating it from all fear of a Polish