In the beginning of the year the queen of Hungary had assembled two considerable armies in Moravia and Bohemia. Prince Charles of Lorraine, at the head of fifty thousand men, advanced against the Saxons and Prussians, who thought proper to retire with precipitation from Moravia, which they had invaded. Then the prince took the route to Bohemia; and marshal Broglio, who commanded the French forces in that country, must have fallen a sacrifice, had not the king of Prussia received a strong reinforcement, and entered that kingdom before his allies could be attacked. The two armies advanced towards each other; and on the seventeenth of May joined battle at Czaslaw, where the Austrians at first gained a manifest advantage, and penetrated as far as the Prussian baggage; then the irregulars began to plunder so eagerly, that they neglected every other consideration. The Prussian infantry took this opportunity to rally; the battle was renewed, and after a very obstinate contest, the victory was snatched out of the hands of the Austrians, who were obliged to retire with the loss of five thousand men killed, and twelve hundred taken by the enemy. The Prussians paid dear for the honour of remaining on the field of battle; and from the circumstances of this action, the king is said to have conceived a disgust to the war. When the Austrians made such progress in the beginning of the engagement, he rode off with great expedition, until he was recalled by a message from his general, the count de Schwerin, assuring his majesty that there was no danger of a defeat. Immediately after this battle, he discovered an inclination to accommodate all differences with the queen of Hungary. The earl of Hyndford, ambassador from the court of Great Britain, who accompanied him in this campaign, and was vested with full powers by her Hungarian majesty, did not fail to cultivate this favourable disposition; and on the first day of June, a treaty of peace between the two powers was concluded at Breslau. The queen ceded to his Prussian majesty the Upper and Lower Selesia, with the county of Glatz in Bohemia; and he charged himself with the payment of the sum lent by the merchants of London to the late emperor, on the Silesian revenues. He likewise engaged to observe a strict neutrality during the war, and to withdraw his forces from Bohemia in fifteen, days after the ratification of the treaty, in which were comprehended the king of Great Britain elector of Hanover, the czarina, the king of Denmark, the states-general, the house of Wolfenbuttle, and the king of Poland elector of Saxony, on certain conditions, which were accepted.
The king of Prussia recalled his troops; while mare-schal Broglio, who commanded the French auxiliaries in that kingdom, and the count de Belleisle, abandoned their magazines and baggage, and retired with precipitation under the cannon of Prague. There they intrenched themselves in an advantageous situation; and prince Charles being joined by the other body of Austrians, under prince Lobkowitz, encamped in sight of them on the hills of Girinsnitz. The grand duke of Tuscany arrived in the Austrian army, of which he took the command; and the French generals offered to surrender Prague, Egra, and all the other places they possessed in Bohemia, provided they might be allowed to march off with their arms, artillery, and baggage. The proposal was rejected, and Prague invested on all sides about the end of July. Though the operations of the siege were carried on in an awkward and slovenly manner, the place was so effectually blocked up, that famine must have compelled the French to surrender at discretion, had not very extraordinary efforts been made for their relief. The emperor had made advances to the queen of Hungary. He promised that the French forces should quit Bohemia, and evacuate the empire; and he offered to renounce all pretensions to the kingdom of Bohemia, on condition that the Austrians would restore Bavaria; but these conditions were declined by the court of Vienna. The king of France was no sooner apprized of the condition to which the generals Broglio and Belleisle were reduced, than he sent orders to mareshal Maillebois, who commanded his army on the Bhine, to march to their relief. His troops were immediately put in motion; and when they reached Amberg in the Upper Palatinate, were joined by the French and Imperialists from Bavaria. Prince Charles of Lorraine having received intelligence of their junction and design, left eighteen thousand men to maintain the blockade of Prague, under the command of general Festititz, while he himself, with the rest of his army, advanced to Hay-don on the frontiers of Bohemia. There he was joined by count Khevenhuller, who from Bavaria had followed the enemy, now commanded by count Seckendorf, and the count de Saxe. Seckendorf however was sent back to Bavaria, while mareschal Maillebois entered Bohemia on the twenty-fifth day of September. But he marched with such precaution, that prince Charles could not bring him to an engagement. Meanwhile Festititz, for want of sufficient force, was obliged to abandon the blockade of Prague; and the French generals being now at liberty, took post at Leutmaritz. Maillebois advanced as far as Kadan; but seeing the Austrians possessed of all the passes of the mountains, he marched back to the palatinate, and was miserably harassed in his retreat by prince Charles, who had left a strong body with prince Lobkowitz to watch the motions of Belleisle and Broglio.