Instead, therefore, of listening to the wise counsels of Wallenstein he hastened to augment his forces.  Spain sent him considerable supplies, negotiated for him with the ever vacillating Elector of Saxony, and levied troops for him in Italy.  The Elector of Bavaria increased his army, and the Duke of Lorraine prepared again to take part in the struggle which now seemed to offer him an easy opportunity of increasing his dominions.  For a time the Elector of Saxony, the Duke of Brunswick, and many others of the German princes wavered; but when they saw that Ferdinand, so far from being disposed to offer them favourable terms to detach them from the league, was preparing with greater vigour than ever to overwhelm them, they perceived that their interest was to remain faithful to their ally, and at a great meeting of princes and deputies held at Heilbronn the alliance was re-established on a firmer basis.

Before, however, the solemn compact was ratified scarce one of the German princes and nobles but required of Oxenstiern the gratification of private greed and ambition, and each bargained for some possession either already wrested or to be afterwards taken from the enemy.  To the Landgrave of Hesse the abbacies of Paderborn, Corvey, Munster, and Fulda were promised, to Duke Bernhard of Weimar the Franconian bishoprics, to the Duke of Wurtemburg the ecclesiastical domains and the Austrian counties lying within his territories, all to be held as fiefs of Sweden.

Oxenstiern, an upright and conscientious man, was disgusted at the greed of these princes and nobles who professed to be warring solely in defence of their religious liberties, and he once exclaimed that he would have it entered in the Swedish archives as an everlasting memorial that a prince of the German empire made a request for such and such territory from a Swedish nobleman, and that the Swedish noble complied with the request by granting him German lands.  However, the negotiations were at last completed, the Saxons marched towards Lusatia and Silesia to act in conjunction with Count Thurn against the Austrians in that quarter, a part of the Swedish army was led by the Duke of Weimar into Franconia, and the other by George, Duke of Brunswick, into Westphalia and Lower Saxony.

When Gustavus had marched south from Ingolstadt on the news of Wallenstein’s entry into Saxony he had left the Count Palatine of Birkenfeld and General Banner to maintain the Swedish conquests in Bavaria.  These generals had in the first instance pressed their conquests southward as far as Lake Constance; but towards the end of the year the Bavarian General Altringer pressed them with so powerful an army that Banner sent urgent requests to Horn to come to his assistance from Alsace, where he had been carrying all before him.  Confiding his conquests to the Rhinegrave Otto Ludwig, Horn marched at the head of seven thousand men towards Swabia.  Before he could join Banner, however, Altringer had forced the line of the Lech,