Commander of Blücher’s I Corps in the Waterloo campaign. A veteran of the monster ‘Battle of the Nations’ at Leipzig in 1813, Ziethen took the field in 1815 as one of Prussia’s top generals. His I Corps took the brunt of Napoleon’s advance into Belgium on 15 June, General Bourmont of Napoleon’s 14th Infantry Division having already presented the Prussian general with the Emperor’s plan of campaign. Next day, Ziethen’s corps was in the thick of the fighting at Ligny, and afterwards retired north on Wavre with the rest of Blücher’s defeated army.