So soon as he realised that his negotiation with Austria might break down, Frederick turned to France. On January 5, 1741, he wrote to Fleury from Breslau:
“My dear Cardinal, I am deeply impressed by all the assurances of friendship which you give me and I will always reply to them with the same sincerity. It depends only upon you, by favouring the justice of my title to Silesia, to make eternal the bonds which will unite us. If I did not make you a sharer in my plans at first it was through forgetfulness rather than for any other reason. It is not everyone who is as unfettered amid his work as yourself, and to Cardinal Fleury alone is it granted to think of and to provide for everything.”
And in sending the letter he added:
“I ask nothing better than a close union with His Most Christian Majesty, whose interests will always be dear to me, and I flatter myself that he will have no less regard for mine.”
At the same time he was making proposals for a close union with the natural enemy of France. In the same month, January, 1741, he addressed the following sentences to George II.:
“My Brother! I am delighted to see that I have not deceived myself in placing confidence in Your Majesty.
“As I have had no alliance with anyone I have not been able to open my mind to anyone; but as I see Your Majesty’s good intentions I regard you as already my ally, from whom I ought in future to have nothing secret or concealed. Far from desiring to disturb Europe, I demand only that heed be paid to the justice of my uncontestable rights. I place unbounded confidence in Your Majesty’s friendship and in the common interests of Protestant princes, which require that those oppressed for their religion should be succoured. The tyranny under which the Silesians have groaned is frightful, and the barbarity of the Catholics towards them inexpressible. If the Protestants lose me they have no other resort.
“If Your Majesty desires to attach to yourself a faithful ally of inviolable constancy, this is the time: our interests, our religion, our blood is the same, and it would be sad to see ourselves acting against each other: it would be still more grievous to oblige me to concur in the great plans of France, which I intend to do only if I am compelled.”
The question of alliances was still unsettled on February 19th, when Frederick again left Berlin for the scene of war. Prussia might be doomed to act alone; her safety lay in her own right hand. New armies were set on foot, but a skirmish at Baumgarten, in which he narrowly escaped capture, proved to Frederick that the Austrians were moving and that his own troops were not all that could be desired. Nor was the Prussian strategy above criticism. The Old Dessauer, the father of the army, held up his hands in horror at the dispositions of Schwerin. Weak detachments were cantoned everywhere and the mountain-passes not secured, although Neisse, Brieg, and Glogau were still Austrian, and the Prussians would be at the mercy of an army entering Silesia from the Bohemian side.
But soon the King’s spirits, which had been depressed by the danger of a European coalition against him, were raised and the military situation greatly improved by a brilliant feat of the Young Dessauer. Glogau, Frederick had been pleased to decree, must be taken. At midnight on March 8th-9th, therefore, a combined assault was made with that perfect organisation and cool courage which already distinguished the Prussian infantry. In an hour the work was done, at a speed which made the loss on each side the merest trifle. Frederick could congratulate his lieutenant on “the prettiest military stroke that has been done in this century,” and himself on the acquisition of an open highroad to Breslau. The capital now became a safe central storehouse for the Prussians, and its value as a base of operations was greatly enhanced by the gain of control over the Oder. So far as Glogau itself was concerned, it may be convenient to remark that the work had never to be done a second time. In a wall near the northern portal may be seen a stone inscribed F. R. 1741—a token of Prussian sovereignty which from that day to this has suffered no erasure.
The next task was to secure Neisse, the Glogau of Upper Silesia. The problem was complicated by the fact that the Austrians had succeeded in flinging a thousand men into the fortress, and that a relieving army under Marshal Neipperg was known to be on its way from Vienna. Frederick therefore determined to turn the blockade into an active siege, while one covering army was established to the westward., and Schwerin received orders to concentrate another to the south-east. The detachments were being called in for this purpose when the King had to acknowledge a surprise which led to the first pitched battle of the war and which might have ruined his whole enterprise. While Schwerin was carefully shutting the south-eastern gate of Silesia in Neipperg’s face, the marshal passed him on his right and, by a creditable march over roads supposed to be impracticable, arrived at Neisse on April 5th. The advantage of this bold move was soon apparent. Frederick and Schwerin, who had been within an ace of capture, were also marching northwards, but they were separated from their friends by the river Neisse and by a superior force of the enemy. Neipperg was strong in cavalry and longed to follow up his advantage by crushing the Prussians in detail.
Frederick was saved, however, by Neipperg’s ignorance of the strength and position of his foes. With a force of less than sixteen thousand men, the marshal’s plain duty was to use his temporary superiority in numbers by meeting the enemy in the field and striving to destroy him. Failing in this, he might make for Ohlau and the magazine. But after crossing the Neisse, he lost touch with Frederick’s force and believed himself to be between hostile armies on the north and south-east. Snow and rain hampered his movements and chilled his men. He therefore abandoned the initiative, and on April 9th sat down within sight of friendly Brieg to await events. He was right in supposing that a Prussian force lay to the south-east of him. It was the army of Frederick and Schwerin, which had received reinforcements from all sides. It was three times as strong as he believed it could be, and it was within five miles of his camp. He was wrong, however, in supposing that a stronger force lay to the north in Ohlau. Ohlau was weak and Frederick was hastening thither to save his heavy artillery and magazine. Neipperg lay right across his path and a battle was inevitable. It would soon be proved whether the Prussian troops were indeed as brave as they were handsome, or whether Europe was right in thinking that Prussia would pay dear for the presumption of her King.