To do the King justice, he pretended to no more virtue than he had. In manifestoes he might, for form's sake, insert some idle stories about his antiquated claim on Silesia; but in his conversations and Memoirs he took a very different tone. His own words are: "Ambition, interest, the desire of making people talk about me, carried the day; and I decided for war."
Having resolved on his course, he acted with ability and vigor. It was impossible wholly to conceal his preparations; for throughout the Prussian territories regiments, guns, and baggage were in motion. The Austrian envoy at Berlin apprised his court of these facts, and expressed a suspicion of Frederic's designs; but the ministers of Maria Theresa refused to give credit to so black an imputation on a young prince who was known chiefly by his high professions of integrity and philanthropy. "We will not," they wrote, "we cannot, believe it."
In the meantime the Prussian forces had been assembled. Without any declaration of war, without any demand for reparation, in the very act of pouring forth compliments and assurances of good will, Frederic commenced hostilities. Many thousands of his troops were actually in Silesia before the Queen of Hungary knew that he had set up any claim to any part of her territories. At length he sent her a message which could be regarded only as an insult. If she would but let him have Silesia, he would, he said, stand by her against any power which should try to deprive her of her other dominions; as if he was not already bound to stand by her, or as if his new promise could be of more value than the old one.
It was the depth of winter. The cold was severe, and the roads heavy with mire. But the Prussians pressed on. Resistance was impossible. The Austrian army was then neither numerous nor efficient. The small portion of that army which lay in Silesia was unprepared for hostilities. Glogau was blockaded; Breslau opened its gates; Ohlau was evacuated. A few scattered garrisons still held out; but the whole open country was subjugated: no enemy ventured to encounter the King in the field; and, before the end of January, 1741, he returned to receive the congratulations of his subjects at Berlin.