What are Napoleon's three big mistakes?

Written by Editorial Team | Last Updated: August 2026

Historical analysis of Napoleon Bonaparte's military and political downfall frequently highlights three critical strategic errors that eroded the French Empire. The first major mistake was the implementation of the Continental System, an embargo blockade against British trade that failed economically and provoked widespread European resentment. The second catastrophic error was the Peninsular War in Spain and Portugal, which bogged down hundreds of thousands of French troops in a grueling, protracted guerrilla conflict. The third and most devastating miscalculation was the disastrous invasion of Russia in 1812, which decimated the Grand Army through harsh winters, supply failures, and attrition.

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