The plans of George II of England came to naught, and Frederick resumed hostilities, for the Empress would never consent to give up Silesia; but he knew his task was a hard one. In Silesia the Hungarians had taken Kosel. A part of his army was sent to recapture it and drive them out, in which it was successful. Another detachment went to join old Dessauer at Halle, to oppose the Saxons who were threatening Brandenburg. Frederick had but twenty-two thousand men to oppose a superior force of Austrians, and delay had placed them at a disadvantage; for it had enabled the enemy to approach so near that an attack could not be avoided. He determined therefore to change his position and move farther away; but just as he was about to put this plan into execution, Charles of Lorraine began his assault. It was on the morning of September 30, 1745, near Sohr. Frederick still had time to dispose his troops; then he hurled his cavalry against the Austrians. This was the beginning of a battle that resulted in a brilliant victory for the Prussians, for the infantry with magnificent bravery followed the example of the cavalry. For five days Frederick’s army camped undisturbed on the battlefield, and then moved toward Silesia to go into Winter quarters. Once more there were hopes of peace, but it was not yet to be. In Vienna a Winter campaign had been determined on. The army was to advance directly to Berlin under the Prince of Lorraine. One division on the Rhine was to unite with Saxony in driving the Prussians from Halle, and then join the main army before Berlin. Maria Theresa’s secret plans were betrayed, however, to the King of Prussia, and that enabled him to set every lever in motion to thwart her projects, in accordance with his favorite method, “anticipate the disaster.” It was dangerous work for him, for Russia had promised to support Saxony in case of attack from Prussia, and the warning was repeated when Frederick announced his purpose; but strong measures were necessary, and he departed to join the main body of his army in Silesia. Here he learned that Prince Charles and the Saxons had invaded Upper Lusatia. After seeing that the Silesian frontier was well protected, therefore, he hastened with all possible secrecy to Lusatia and met the enemy at Kunersdorf. His sudden attack was successful, and put an end to all hopes of taking Berlin by surprise. The unexpected appearance of the Prussians and their victory disheartened the Austrian army, and Prince Charles retreated to Bohemia.