In October, 1723, when the prince was eleven years of age, his grandfather, George I., came to Berlin to visit his daughter and his son-in-law, the mother and father of Fritz. From the windows of his apartment he looked out with much interest upon Fritz, drilling his cadet company upon the esplanade in front of the palace. The clock-work precision of the movements of the boy soldiers greatly surprised him.
While on this tour of inspection, the celebrated French philosopher DAlembert, by appointment, met the king at Geldern, and accompanied him to Potsdam. DAlembert was in entire sympathy with the king in his renunciation of Christianity. In 1755 DAlembert had, by invitation, met Frederick at Wesel, on the Rhine. In a letter to Madame Du Deffand, at Paris, dated Potsdam, June 25, 1763, DAlembert wrote:
Director
His Prussian majesty rides much about, often at a rapid rate, with a pleasant business aspecthumane, though imperative; handsome to look upon, though with a face perceptibly reddish. His age, now thirty-eight gone; a set appearance, as if already got into his forties; complexion florid; figure muscular, almost tending to be plump.If we can rely upon the testimony of Frederick, an incident occurred at this time which showed that the French court was as intriguing and unprincipled as was his Prussian majesty. It is quite evident that the Austrian court also was not animated by a very high sense of honor.Thus influenced, she yielded. Tears flooded her eyes, and her voice was broken with sobs as she said, I am ready to sacrifice myself for the peace of the family. The deputation withdrew, leaving the princess in despair. Baron Grumkow conveyed to the king the pleasing intelligence of her submission.