Ferdinand, Duke of Brunswick-Lüneburg-Wolfenbüttel, brother-in-law of Frederick the Great, Prussian Field Marshal (1721-1792). Letter from "Ferdinand HZBLL". 1 p. Double leaf. 4to. Dresden 27.XI.1756. At the beginning of the Seven Years' War, Ferdinand commanded one of the three pillars of the army that entered Saxony. "... Ewd. Throughl. and Liebden have kept the blocquirung of the Saxon armée 5erley dispositions ready, if the Saxon Armée entrepreniren, in one or the other way search to break through. If, therefore, they want the same from the exceptional goodness, they are inclined to communicate me - they would commit me to the highest. I will recognize it with the greatest thanks ...". - Throughout the course of the war Ferdinand gained a number of victories and was one of the most successful commanders of Frederick the Great.