France Invades Mexico and Installs Maximilian as Emperor
Napoleon III uses unpaid debt as a pretext to put an Austrian archduke on a Mexican throne, defended by a young general named Porfirio Diaz
Quick facts
- Battle of Puebla (Cinco de Mayo)
- 5 May 1862
- Maximilian invited / arrived
- 1863 / 1864
- Diaz retakes Oaxaca
- 31 October 1866
- Second Battle of Puebla
- 2 April 1867
What happened
After Juarez suspended payments on Mexico's foreign debt in 1861, Britain, Spain, and France signed a tripartite agreement to intervene and recover the money, but Napoleon III alone pursued a larger goal: reviving French global influence by installing a monarchy in Mexico. A French army advancing on Puebla was unexpectedly defeated on 5 May 1862, a battle in which a young general named Porfirio Diaz played a decisive role, but France sent reinforcements, took Mexico City by 1863, and in 1863 Napoleon III invited Austrian archduke Maximilian von Habsburg to become Emperor of Mexico; Maximilian accepted and arrived in 1864 with French backing and the support of Mexican conservatives and the Church. Juarez's government retreated but never surrendered, and Diaz continued fighting the French as a guerrilla commander even after being captured on several occasions, escaping each time, until he took Oaxaca on 31 October 1866 and helped defeat French forces again at Puebla on 2 April 1867.
Why it matters
Cinco de Mayo commemorates a battle Mexico won but a war it initially lost, since the French occupation succeeded in installing Maximilian for three years; the date's later prominence, especially in the United States, has more to do with 19th-century Mexican-American communities adopting it than with the battle's immediate strategic effect, which was to delay rather than prevent the French intervention.
How we know
The Office of the Historian's account of the French intervention documents the 1861 tripartite agreement, Napoleon III's aims, and Maximilian's 1863-1864 installation; Diaz's role at both battles of Puebla is recorded in the Library of Congress's exhibition materials on his career.
Sources
- Office of the Historian, U.S. Department of State. French Intervention in Mexico and the American Civil War · Reputable sourcehistory.state.gov · The domain "history.state.gov" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
- The Mexican Revolution and the United States exhibit, Library of Congress. Porfirio Diaz in 1867 (age 37) · Primary sourceloc.gov · The domain "loc.gov" is on our Primary source registry. · Link is live and its text matches the event's key terms (Jul 2026)
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