Fifteen days had the two armies now remained in view of each other, equally defended by inaccessible entrenchments, without attempting anything more than slight attacks and unimportant skirmishes. On both sides, infectious diseases, the natural consequence of bad food, and a crowded population, had occasioned a greater loss than the sword. And this evil daily increased. But at length, the long expected succours arrived in the Swedish camp; and by this strong reinforcement, the King was now enabled to obey the dictates of his native courage, and to break the chains which had hitherto fettered him.
In obedience to his requisitions, the Duke of Weimar had hastily drawn together a corps from the garrisons in Lower Saxony and Thuringia, which, at Schweinfurt in Franconia, was joined by four Saxon regiments, and at Kitzingen by the corps of the Rhine, which the Landgrave of Hesse, and the Palatine of Birkenfeld, despatched to the relief of the King. The Chancellor, Oxenstiern, undertook to lead this force to its destination. After being joined at Windsheim by the Duke of Weimar himself, and the Swedish General Banner, he advanced by rapid marches to Bruck and Eltersdorf, where he passed the Rednitz, and reached the Swedish camp in safety. This reinforcement amounted to nearly 50,000 men, and was attended by a train of 60 pieces of cannon, and 4,000 baggage waggons. Gustavus now saw himself at the head of an army of nearly 70,000 strong, without reckoning the militia of Nuremberg, which, in case of necessity, could bring into the field about 30,000 fighting men; a formidable force, opposed to another not less formidable. The war seemed at length compressed to the point of a single battle, which was to decide its fearful issue. With divided sympathies, Europe looked with anxiety to this scene, where the whole strength of the two contending parties was fearfully drawn, as it were, to a focus.
If, before the arrival of the Swedish succours, a want of provisions had been felt, the evil was now fearfully increased to a dreadful height in both camps, for Wallenstein had also received reinforcements from Bavaria. Besides the 120,000 men confronted to each other, and more than 50,000 horses, in the two armies, and besides the inhabitants of Nuremberg, whose number far exceeded the Swedish army, there were in the camp of Wallenstein about 15,000 women, with as many drivers, and nearly the same number in that of the Swedes. The custom of the time permitted the soldier to carry his family with him to the field. A number of prostitutes followed the Imperialists; while, with the view of preventing such excesses, Gustavus's care for the morals of his soldiers promoted marriages. For the rising generation, who had this camp for their home and country, regular military schools were established, which educated a race of excellent warriors, by which means the army might in a manner recruit itself in the course of a long campaign. No wonder, then, if these wandering nations exhausted every territory in which they encamped, and by their immense consumption raised the necessaries of life to an exorbitant price. All the mills of Nuremberg were insufficient to grind the corn required for each day; and 15,000 pounds of bread, which were daily delivered, by the town into the Swedish camp, excited, without allaying, the hunger of the soldiers. The laudable exertions of the magistrates of Nuremberg could not prevent the greater part of the horses from dying for want of forage, while the increasing mortality in the camp consigned more than a hundred men daily to the grave.
To put an end to these distresses, Gustavus Adolphus, relying on his numerical superiority, left his lines on the 25th day, forming before the enemy in order of battle, while he cannonaded the duke's camp from three batteries erected on the side of the Rednitz. But the duke remained immoveable in his entrenchments, and contented himself with answering this challenge by a distant fire of cannon and musketry. His plan was to wear out the king by his inactivity, and by the force of famine to overcome his resolute determination; and neither the remonstrances of Maximilian, and the impatience of his army, nor the ridicule of his opponent, could shake his purpose. Gustavus, deceived in his hope of forcing a battle, and compelled by his increasing necessities, now attempted impossibilities, and resolved to storm a position which art and nature had combined to render impregnable.
Intrusting his own camp to the militia of Nuremberg, on the fifty-eighth day of his encampment, (the festival of St. Bartholomew,) he advanced in full order of battle, and passing the Rednitz at Furth, easily drove the enemy's outposts before him. The main army of the Imperialists was posted on the steep heights between the Biber and the Rednitz, called the Old Fortress and Altenberg; while the camp itself, commanded by these eminences, spread out immeasurably along the plain. On these heights, the whole of the artillery was placed. Deep trenches surrounded inaccessible redoubts, while thick barricadoes, with pointed palisades, defended the approaches to the heights, from the summits of which, Wallenstein calmly and securely discharged the lightnings of his artillery from amid the dark thunder-clouds of smoke. A destructive fire of musketry was maintained behind the breastworks, and a hundred pieces of cannon threatened the desperate assailant with certain destruction. Against this dangerous post Gustavus now directed his attack; five hundred musketeers, supported by a few infantry, (for a greater number could not act in the narrow space,) enjoyed the unenvied privilege of first throwing themselves into the open jaws of death. The assault was furious, the resistance obstinate. Exposed to the whole fire of the enemy's artillery, and infuriate by the prospect of inevitable death, these determined warriors rushed forward to storm the heights; which, in an instant, converted into a flaming volcano, discharged on them a shower of shot. At the same moment, the heavy cavalry rushed forward into the openings which the artillery had made in the close ranks of the assailants, and divided them; till the intrepid band, conquered by the strength of nature and of man, took to flight, leaving a hundred dead upon the field. To Germans had Gustavus yielded this post of honour. Exasperated at their retreat, he now led on his Finlanders to the attack, thinking, by their northern courage, to shame the cowardice of the Germans. But they, also, after a similar hot reception, yielded to the superiority of the enemy; and a third regiment succeeded them to experience the same fate. This was replaced by a fourth, a fifth, and a sixth; so that, during a ten hours' action, every regiment was brought to the attack to retire with bloody loss from the contest. A thousand mangled bodies covered the field; yet Gustavus undauntedly maintained the attack, and Wallenstein held his position unshaken.