An eyewitness memoir reconstructs the campaign and the climactic 1815 battle near Brussels, combining first‑hand recollections from long residence on the field with collected testimony, official dispatches, plans, and contemporary illustrations. The narrative follows the political and military lead‑up, the disposition and movements of forces, and the principal engagements and turning points, while addressing disputed timings, actions, and claims of honor. Maps, selected orders and letters, portraits, and engraved plans are used to clarify conflicting accounts and present a concise, corrective history intended for general readers and visitors to the battlefield.