US ResearchConflictsRevolutionary WarAction at St. Louis (Spanish Fort San Carlos)
Revolutionary War

Action at St. Louis (Spanish Fort San Carlos)

1780
Illinois
Era
Revolutionary War
Year
1780
Location
Illinois
Status
Verified engagement
The Combatants

Who Fought

Forces
Not recorded in historical accounts
Forces
defenders of the Franco-Spanish village of St. Louis, Louisiana
VS
Victor
American/Patriot
Forces
British-allied Indians
Outcome
De Leyba's garrison successfully withstood the attack on St. Louis, while the American defenders of Cahokia repulsed the simultaneous assault on their village. The British failed to defend their side of the river, effectively ending any attempts to gain control of the Mississippi River during the Revolutionary War.
The Battle

History & Significance

Louis, also known as the Attack on St. Louis and the Battle of Fort San Carlos, was fought on May 26, 1780, between British-allied Indians and defenders of the Franco-Spanish village of St. Louis, Louisiana during the American Revolutionary War.

Duration
Single day engagement (May 26, 1780)
Historical context

The American Revolutionary War (1775–1783) grew from colonial resistance to British taxation without parliamentary representation — a dispute that radicalized through the Stamp Act (1765), the Townshend Acts (1767), and the Boston Massacre (1770). Fighting began at Lexington and Concord in April 1775; the Continental Congress declared independence on July 4, 1776. The Continental Army under George Washington faced severe shortages of supplies and troops, enduring the brutal winter at Valley Forge (1777–1778) before French alliance and French financing turned the military balance. Major engagements included Bunker Hill (1775), Trenton (1776), Saratoga (1777) — which secured French intervention — and Yorktown (1781), where British General Cornwallis surrendered to Washington. An estimated 25,000 American soldiers died in service, from combat, disease, and captivity. The Treaty of Paris (1783) recognized American independence and ceded British territory east of the Mississippi, though it left unresolved questions about Indigenous land rights and the status of Loyalists.

Casualties & Losses

a small number of casualties

Questions & Answers

Frequently Asked Questions

When did Action at St. Louis (Spanish Fort San Carlos) take place?
Action at St. Louis (Spanish Fort San Carlos) took place in 1780. Single day engagement (May 26, 1780).
Where was Action at St. Louis (Spanish Fort San Carlos) fought?
Action at St. Louis (Spanish Fort San Carlos) was fought in Illinois, United States.
What was the outcome of Action at St. Louis (Spanish Fort San Carlos)?
De Leyba's garrison successfully withstood the attack on St. Louis, while the American defenders of Cahokia repulsed the simultaneous assault on their village. The British failed to defend their side of the river, effectively ending any attempts to gain control of the Mississippi River during the Revolutionary War.
What was the significance of Action at St. Louis (Spanish Fort San Carlos)?
Louis, also known as the Attack on St. Louis and the Battle of Fort San Carlos, was fought on May 26, 1780, between British-allied Indians and defenders of the Franco-Spanish village of St. Louis, Louisiana during the American Revolutionary War.
More from this era

Other Revolutionary War Engagements

Capture of Kaskaskia
1778
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Battle of Kaskaskia (Clark's Illinois Campaign)
1778
Illinois
Clark's Kaskaskia Expedition
1778
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Battle of Kaskaskia Jul 4 1778
1778
Illinois
Capture of Cahokia (Illinois 1778)
1778
Illinois
Capture of Kaskaskia (Clark)
1778
Illinois
Battle of Cahokia Jul 1778
1778
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Capture of Cahokia (Clark)
1778
Illinois
All battles in Illinois
Source

Content adapted from Wikipedia under the Creative Commons Attribution-ShareAlike 4.0 International License. Wikipedia source.

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