To add to the embarrassments of Frederick, the King of Poland, entirely under the control of his minister Brühl, who hated Frederick, entered into an alliance with Maria Theresa, and engaged to furnish her with thirty thousand troops, who were to be supported by the sea powers England and Holland, who were also in close alliance with Austria.
Maria Theresa, greatly elated by her success in driving the Prussians out of Bohemia, resolved immediately, notwithstanding the severity of the season, to push her armies through the “Giant Mountains” for the reconquering of Silesia. She ordered her generals to press on with the utmost energy and overrun the whole country. At the same time she issued a manifesto, declaring that the treaty of Breslau was a treaty no longer; that the Silesians were absolved from all oaths of allegiance to the King of Prussia, and that they were to hold themselves in readiness to take the oath anew to the Queen of Hungary.
On the 18th of December a strong Austrian army entered Silesia and took possession of the country of Glatz. The Prussian troops were withdrawn in good order to their strong fortresses on the Oder. The old Prince Leopold, the cast-iron man, called the Old Dessauer, the most inflexible of mortals, was left in command of the Prussian troops. He was, however, quite seriously alienated from Frederick. A veteran soldier, having spent his lifetime on fields of blood, and having served the monarchs of Prussia when Frederick was but a child, and who had been the military instructor of the young prince, he deemed himself entitled to consideration which an inexperienced officer might not command. In one of the marches to which we have referred, Leopold ventured to take a route different from that which Frederick had prescribed to him. In the following terms the Prussian king reprimanded him for his disobedience:
“I am greatly surprised that your excellency does not more accurately follow my orders. If you were more skillful than Cæsar, and did not with strict fidelity obey my directions, all else were of no help to me. I hope this notice, once for all, will be enough, and that in future you will give no cause for complaint.”
Prince Leopold was keenly wounded by this reproof. Though he uttered not a word in self-defense, he was ever after, in the presence of his majesty, very silent, distant, and reserved. Though scrupulously faithful in every duty, he compelled the king to feel that an impassable wall of separation had risen up between them. He was seeking for an honorable pretext to withdraw from his majesty’s service.
Frederick had hardly reached Berlin ere he was astonished to learn, from dispatches from the Old Dessauer, that the Austrians, not content with driving him out of Bohemia, had actually invaded Silesia. Amazed, or affecting amazement, at such audacity, he sent reiterated and impatient orders to his veteran general to fall immediately upon the insolent foe and crush him.
“Hurl them out,” he wrote. “Gather twenty, thirty thousand men, if need be. Let there be no delay. I will as soon be pitched out of Brandenburg as out of Silesia.”
But it was much easier for Frederick to issue these orders than for Leopold to execute them. As Leopold could not, in a day, gather sufficient force to warrant an attack upon the Austrians, the king was greatly irritated, and allowed himself to write to Leopold in a strain of which he must afterward have been much ashamed. On the 19th he addressed a note to the veteran officer couched in the following terms:
“On the 21st I leave Berlin, and mean to be at Neisse on the 24th at least. Your excellency will, in the mean time, make out the order of battle for the regiments which have come in. For I will, on the 25th, without delay, cross the Neisse, and attack those people, cost what it may, and chase them out of Silesia, and follow them as far as possible. You will, therefore, take measure and provide every thing, that the project may be executed the moment I arrive.”
In this fiery humor, the king leaped upon his horse and galloped to Schweidnitz. Here he met the Old Dessauer. He must have been not a little mortified to learn that his veteran general was right, and he utterly in the wrong. Prince Charles had returned home. Marshal Traun was in command of the Austrians. He had a compact army of 20,000 men, flushed with victory and surrounded by countless thousands of Pandours, who veiled every movement from view. He had established himself in an impregnable position on the south side of the Neisse, where he could not be assailed, with any prospect of success, by the force which Leopold could then summon to his aid.