A victory at Waterloo could have prolonged Napoleon’s rule and changed the next stage of the 1815 campaign. It would not, by itself, have defeated every power opposed to him or guaranteed a lasting French empire.
What actually happened?
The Battle of Waterloo was fought on 18 June 1815. Napoleon’s army faced Wellington’s allied force, with Blücher’s Prussian army playing a decisive part in the coalition victory. The National Army Museum’s account places the battle within the campaign and explains the armies and fighting.
This matters because a battlefield outcome and a diplomatic settlement are different events. A useful alternate history must connect them rather than jumping straight from victory to permanent peace.
Change one event
Suppose the Prussian intervention is delayed long enough for Napoleon to defeat Wellington’s army. Keep France’s political pressures and the wider coalition in place.
- Immediately: losses, exhaustion and the condition of roads affect pursuit. Winning troops do not become fresh troops.
- Following weeks: Napoleon must decide how to exploit the victory while opponents regroup.
- Following months: diplomacy depends on whether other governments still expect to defeat him. A negotiation is possible, not assured.
What remains uncertain?
The scale of the imagined victory matters. A narrow success with heavy losses creates a different branch from the destruction of an opposing army. State which outcome you mean before drawing conclusions.
A British defeat would also not establish immediate French control of Britain. That would require a separate military and logistical argument.
Classroom investigation
Draw two columns: resources gained by victory and problems left unresolved. Write a short cabinet briefing explaining whether negotiations or another campaign seem more plausible. Include the strongest objection to your own judgement.
Sources and evidence
- National Army Museum: Battle of Waterloo — historical battle and campaign context.
- National Army Museum: Waterloo collection and learning — further material.
Explore your own branch
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*AI-assisted editorial refresh: 7 September 2026. Sources support the historical starting point; alternate outcomes are explicitly hypothetical.*