Marston. The text includes numerous eye-witness accounts of the action, accompanied by explanatory maps.Gniesenau was one of the prime architects of the Prussian military reforms 1806-1811. He was made Blucher's chief of staff from 1813 through the Waterloo campaign. Not only the most important life of Blucher, but one of our most valuable primary sources for the latter portion of the Napoleonic Wars.