volume 1), chapter 6.

AUSTRIA: A. D. 1742 (June-December). Expulsion of the French from Bohemia. Belleisle's retreat from Prague.

"The Austrian arms began now to be successful in all quarters. Just before the signature of the preliminaries, Prince Lobcowitz, who was stationed at Budweiss with 10,000 men, made an attack on Frauenberg; Broglio and Belleisle advanced from Piseck to relieve the town, and a combat took place at Sahay, in which the Austrians were repulsed with the loss of 500 men. This trifling affair was magnified into a decisive victory. ... Marshal Broglio, elated with this advantage, and relying on the immediate junction of the King of Prussia, remained at Frauenberg in perfect security. But his expectations were disappointed; Frederic had already commenced his secret negotiations, and Prince Charles was enabled to turn his forces against the French. Being joined by Prince Lobcowitz, they attacked Broglio, and compelled him to quit Frauenberg with such precipitation that his baggage fell into the hands of the light troops, and the French retreated towards Branau, harassed by the Croats and other irregulars. ... The Austrians, pursuing their success against the French, drove Broglio from Branau, and followed him to the walls of Prague, where he found Belleisle. ... After several consultations, the two generals called in their posts, and secured their army partly within the walls and partly within a peninsula of the Moldau. ... Soon afterwards the duke of Lorraine joined the army [of Prince Charles], which now amounted to 70 70,000 men, and the arrival of the heavy artillery enabled the Austrians to commence the siege."

_W. Coxe, History of the House of Austria,