Before sunrise Sunday morning the Prussians had seized upon many important posts. About seven oclock a flag of truce, or rather a trumpeter, approached one of the gates, demanding admittance to communicate to the chief magistrate of the city the intentions and requisitions of the Prussian king. After some delay, two colonels were admitted. They demanded the entire surrender of the city, and that the authority of Frederick, the King of Prussia, should be recognized instead of that of Maria Theresa, Queen of Austria. All their local laws and customs were to be respected, and they were to be protected in all their rights and privileges. Their own garrison should guard the city. No Prussian soldier should enter the gates with other than side-arms. The king himself, in taking possession of the city, should be accompanied by a body-guard of but thirty men. The city council was assembled to consider this summons, and thirty hours were spent in anxious deliberation.Fritz had now attained eighteen years of age, and Wilhelmina twenty-one. Fritz was very fond of music, particularly of his flute, upon which he played exquisitely, being, however, careful never to sound its notes within hearing of his father. A celebrated music-master from Dresden, by the name of Quantz, was his teacher. He came occasionally from Dresden and spent a week or two at Potsdam, secretly teaching the young prince.67 The mother of Fritz was in warm sympathy with her son, and aided him in all ways in her power in this gratification. Still it was a very hazardous measure. The fierce old king was quite uncertain in his movements. He might at any hour appear at Potsdam, and no one could tell to what lengths, in case of a discovery, he might go in the intensity of his rage. Fritz had an intimate friend in the army, a young man of about his own age, one Lieutenant Katte, who, when Fritz was with his music-teacher, was stationed on the look-out, that he might give instant warning in case there were any indications of the kings approach. His mother also was prepared, when Quantz was at Potsdam, promptly to dispatch a messenger to her son in case she suspected his father of being about to turn his steps in that direction. In case you refuse, or delay beyond the term, the answer which I hereby of right demand, you will render yourself alone responsible, before the world, for the consequences which infallibly will follow. I am, with much consideration, my cousin, your very affectionate cousin,35 At nine oclock he brings my son down to me, who goes to church and dines with me at twelve oclock. The rest of the day is his own. At half past nine in the evening he shall come and bid me good-night; shall then go directly to his room; very rapidly get off his clothes, wash his hands, and, as soon as that is done, Duhan shall make a prayer on his knees and sing a hymn, all the servants being there again. Instantly after which my son shall get into bed; shall be in bed at half past ten.