In October came the startling news that Berlin itself was threatened, and that a force, said to be fifteen thousand strong, under General Haddick, was in rapid motion towards it. Prince Maurice was ordered to hasten to its defence, and the king also moved in that direction.

The invading force was but four thousand strong. Their numbers, however, were so magnified by rumour that the governor of Berlin, who had but four thousand troops, did not venture to oppose them, but sent the royal family and archives away under a strong escort. Haddick occupied a suburb of the city, but knowing that as soon as his real force was known he would be hotly opposed, and receiving news that Prince Maurice was rapidly approaching, demanded a ransom of 45,000 pounds; and finally accepted 27,000 pounds, and then hurried away. Prince Maurice arrived twenty-four hours later.

The consequences of this little success--magnified by report into "Berlin captured, Prussian royal family in flight."--turned out very advantageous to Frederick. The enthusiasm in Paris and Vienna was enormous, and orders were despatched to the armies to set to, without further delay, and finish the work. Fifteen thousand men were sent from Richelieu's army to reinforce Soubise, who thereupon issued from his mountain stronghold and marched against Leipzig.

Frederick, however, arrived there first, Ferdinand and Maurice joining him a day or two later; and while waiting there, Frederick received the joyful news that England requested him to appoint Duke Ferdinand, of Brunswick, commander-in-chief of the army until now commanded by the Duke of Cumberland, who had just sailed for England.

Pitt had now risen to almost absolute power in England, and was busied in reforming the abuses in the army and navy, dismissing incapable officials, and preparing to render some efficient aid to its hard-pressed ally. The proposal that Prince Ferdinand should assume the command of the army--whose efforts had hitherto been rendered nugatory by the utter incompetence of the Duke of Cumberland who, although personally as brave as a lion, was absolutely ignorant of war--afforded immense satisfaction to the king.

No better choice could have been made. Ferdinand was related to the royal families both of England and Prussia. He was a capable general, prudent and at the same time enterprising, firm under difficulties, ready to seize opportunities; and under his command there was no doubt that the northern army, which had hitherto been useless, and had only been saved from absolute destruction by the incompetence of the French generals, would now play a useful part.

On October 30th Soubise, in spite of his orders to fight, and the fact that he had double the strength of the Prussians, fell back before them. Soubise himself felt no confidence in his troops, but upon the other hand his officers and those of the Confederate army were puffed up with vanity, and remonstrated hotly against retreat.

The next day Frederick came in sight of Soubise's army, which was camped on a height near the town of Weissenfels. Frederick had but one-half of his force with him, the other half, under Keith, being still detached. Five thousand men garrisoned Weissenfels, but Frederick made short work of the place. His cannon burst down the gates, and his troops rushed forward with all speed; but the garrison fled across the bridge over the Saale, which had already been prepared for burning; and they set it on fire in such haste that four hundred were unable to cross, and were made prisoners. The fugitives joined their army on the other side of the Elbe, and its guns opened upon the burning bridge, to prevent the Prussians from trying to extinguish the flames.

The Prussians returned the fire, and the artillery duel was kept up until three o'clock, by which time the bridge was consumed. Frederick had already fixed upon a spot suitable for the erection of another, and during the night, while the enemy were falling back to take up a fresh position upon higher ground, the engineers, working diligently, succeeded in throwing a bridge across.

Keith arrived at Merseburg the next morning. A strong force lay opposite, ready to dispute the passage; but when Soubise found that the king was crossing by his new bridge, he called in all his detachments and marched away, to a strong position, and there set himself in array ready to receive an attack. Keith's bridges were finished on the 3rd of November, and that afternoon he crossed and joined Frederick.