army. During the winter a small force, raised by the Austrian Protestants, joined the Bohemian army in Lower Austria. The first engagement between the Imperialists under Bouquoi and the Bohemians took place (in February) near Langenlois, in Lower Austria; the troops of Ferdinand were entirely successful. Soon afterwards Prince Christian of Anhalt assumed the command of the Bohemian forces, and the jealousy between him and Thurn, the former commander, was one of the many causes that contributed to the speedy downfall of Bohemia. Hostilities of an indecisive character continued during spring and summer up to the moment when the treaty of Ulm and the Saxon declaration in favour of Ferdinand rendered a combined attack on Bohemia possible.
As soon as the treaty of Ulm had guaranteed to Duke Maximilian of Bavaria the security of his own dominions, he lost no time in hurrying to the assistance of the Emperor Ferdinand. His army crossed the frontier of Upper Austria on July 24, and that country submitted almost without resistance. The Protestant Estates, not expecting so rapid an attack, had not sufficiently armed themselves and were disappointed in their hope of aid from Bohemia and Hungary. After the submission of Upper Austria, Maximilian was free to direct his entire attention to Bohemia, as the Protestant movement in Lower Austria had also already collapsed. The Protestant nobles had indeed raised some troops, and they now (August 1) proclaimed Frederick, King of Bohemia, their protector. They were, however, as ill-prepared for war as the Protestants of Upper Austria, and all resistance on their part was soon suppressed with the help of the Emperor's Polish mercenaries, whose ferocity and cruelty spread terror through Lower Austria.
After some deliberation it was settled that the army of the "Liga" should unite with that of Bouquoi, and that they then should conjointly invade Bohemia. Before crossing the frontier, Duke Maximilian addressed a letter to the Estates of Bohemia, informing them that he had received an Imperial "patent" authorizing him to invade Bohemia unless the Estates immediately recognized the authority of Ferdinand, their legitimate sovereign. The Estates answered (August 30) by a letter, the contents of which would excite more admiration had they not been in such entire contradiction to
