This is a letter from Prinz Friedrich Carl of Prussia. The letter is directed to a Dr. Eggars and dated 11 January 1869. The young prince received an extensive military education and was taught by future Generalfeldmarschall Albrecht von Roon. He rose steadily in the Prussian Army and served with distinction in the consolidation wars of 1848, 1849, 1864, and 1866. He played a significant part in the winning of the Battle of Königgrätz in 1866. He held the Austrians at bay with his I. Armee until his cousin, Crown Prince Friedrich Wilhelm, arrived on the battlefield. The Crown Prince’s forces attacked the Austrians’ flank, turning the tide to win the penultimate battle of the 1866 Austro-Prussian War. Prince Friedrich Carl played an equally important role in the 1870-1871 Franco-Prussian War, defeating the French in several key battles. He was promoted to generalfeldmarschall as a result of these victories. The letter is written by a scribe and measures 11 3/16″ x 8 7/8.” The prince’s large, bold signature appears in black ink at the letter’s bottom. It also sports a 3 1/4″ tear extending through the signature’s bottom (following a crease line).