Prussian Generalfeldmarschall (field marshal) who led his army against Napoleon I at the Battle of the Nations at Leipzig in 1813 and at the Battle of Waterloo in 1815 with the Duke of Wellington. LS in German, signed “Blucher,” one page, 6.5 x 6.5, December 26, 1810. Crisply penned untranslated letter. In very good condition, with intersecting folds, irregularly trimmed edges, a few creases, and a couple trivial spots. RRAuction COA.