Frederick had left Grüssau on the 18th of April for his Moravian455 campaign. He returned on the 8th of August, after an absence of sixteen weeks. The campaign had proved an entire failure. A Russian army, fifty thousand strong, under General Fermor, had invaded Brandenburg, just beyond the extreme northern frontier of Silesia. These semi-barbarian soldiers had burned the town of Cüstrin, on the Oder, were besieging the small garrison in its citadel, and were committing the most horrid outrages upon the community around, not only plundering and burning, but even consigning captives to the flames.Frederick William, the Crown Prince, was at the time of the birth of his son Frederick twenty-four years of age. He was a22 very peculiar man, sturdy and thick-set in figure, of strong mental powers, but quite uneducated. He was unpolished in manners, rude in his address, honest and sincere, a stern, persevering worker, despising all luxurious indulgence, and excessively devoted to the routine of military duties.My children, said Frederick that night at parole, after such a days work you deserve rest. This day will send the renown of your name and that of the nation down to the latest posterity. Frederick William.