But while thus ingloriously the German princes deserted the unfortunate Frederick, and while Bohemia, Silesia, and Moravia submitted to the Emperor, a single man, a soldier of fortune, whose only treasure was his sword, Ernest Count Mansfeld, dared, in the Bohemian town of Pilsen, to defy the whole power of Austria. Left without assistance after the battle of Prague by the Elector, to whose service he had devoted himself, and even uncertain whether Frederick would thank him for his perseverance, he alone for some time held out against the imperialists, till the garrison, mutinying for want of pay, sold the town to the Emperor. Undismayed by this reverse, he immediately commenced new levies in the Upper Palatinate, and enlisted the disbanded troops of the Union. A new army of 20,000 men was soon assembled under his banners, the more formidable to the provinces which might be the object of its attack, because it must subsist by plunder. Uncertain where this swarm might light, the neighbouring bishops trembled for their rich possessions, which offered a tempting prey to its ravages. But, pressed by the Duke of Bavaria, who now entered the Upper Palatinate, Mansfeld was compelled to retire. Eluding, by a successful stratagem, the Bavarian general, Tilly, who was in pursuit of him, he suddenly appeared in the Lower Palatinate, and there wreaked upon the bishoprics of the Rhine the severities he had designed for those of Franconia. While the imperial and Bavarian allies thus overran Bohemia, the Spanish general, Spinola, had penetrated with a numerous army from the Netherlands into the Lower Palatinate, which, however, the pacification of Ulm permitted the Union to defend. But their measures were so badly concerted, that one place after another fell into the hands of the Spaniards; and at last, when the Union broke up, the greater part of the country was in the possession of Spain. The Spanish general, Corduba, who commanded these troops after the recall of Spinola, hastily raised the siege of Frankenthal, when Mansfeld entered the Lower Palatinate. But instead of driving the Spaniards out of this province, he hastened across the Rhine to secure for his needy troops shelter and subsistence in Alsace. The open countries on which this swarm of maurauders threw themselves were converted into frightful deserts, and only by enormous contributions could the cities purchase an exemption from plunder. Reinforced by this expedition, Mansfeld again appeared on the Rhine to cover the Lower Palatinate.