Battle of Waterloo (1815): DErlon

Elba, the 7th Coalition, and Napoleon's strike into Belgium to smash Wellington and Blucher apart. Ligny hurt the Prussians; it did not destroy them. Grouchy's chase of Blucher is the French what-if that never dies. Hougoumont soaked men. D'Erlon's attack failed. Ney's cavalry charged squares without enough horse artillery. The Imperial Guard's late attack broke.

Prussian pressure at Plancenoit decided the French right while the ridge still held. The rout unhooked the army. Paris could not be a second 1814. St Helena followed. Vienna's final act had its battlefield seal. Casualties on the ridge became a tourist industry within a generation.

British: Wellington and the squares. Prussian: Blucher's march. French: mud, Grouchy, and betrayal. All three are in the sources; none is the whole ridge. Three stories stays dated: 1815-06-18-am (Late start) in Ridge south of Brussels, present-day Belgium. Michel Ney (French marshal) is a named witness -- The cavalry charges and a later execution (1815) made him a romantic ruin. Cost band: about 40,000-50,000 dead and wounded in one day, usual band. Encyclopedia, not a method.