US ResearchConflictsRevolutionary WarBattle of Fort Mifflin (Pennsylvania)
Revolutionary War

Battle of Fort Mifflin (Pennsylvania)

1777
Pennsylvania
Era
Revolutionary War
Year
1777
Location
Pennsylvania
Status
Verified engagement
The Combatants

Who Fought

Forces
Not recorded in historical accounts
Forces
American
VS
Victor
British (eventually)
Forces
British
Outcome
British occupation of the fort
The Battle

History & Significance

The siege of Fort Mifflin or the siege of Mud Island Fort, which took place from September 26 to November 16, 1777, saw British land batteries commanded by Captain John Montresor and a British naval squadron under Vice Admiral Lord Richard Howe attempt to capture an American fort in the Delaware River that was commanded by Lieutenant Colonel Samuel Smith. The operation finally succeeded after Smith was wounded. His successor, Major Simeon Thayer, subsequently evacuated the fort on the night of November 15, enabling British troops to occupy the place the following morning.

Duration
52 days (September 26, 1777 – November 16, 1777)
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

~400 total

Questions & Answers

Frequently Asked Questions

When did Battle of Fort Mifflin (Pennsylvania) take place?
Battle of Fort Mifflin (Pennsylvania) took place in 1777. 52 days (September 26, 1777 – November 16, 1777).
Where was Battle of Fort Mifflin (Pennsylvania) fought?
Battle of Fort Mifflin (Pennsylvania) was fought in Pennsylvania, United States.
What was the outcome of Battle of Fort Mifflin (Pennsylvania)?
British occupation of the fort
What was the significance of Battle of Fort Mifflin (Pennsylvania)?
The siege of Fort Mifflin or the siege of Mud Island Fort, which took place from September 26 to November 16, 1777, saw British land batteries commanded by Captain John Montresor and a British naval squadron under Vice Admiral Lord Richard Howe attempt to capture an American fort in the Delaware Riv
Protected heritage nearby

Historic Sites near Battle of Fort Mifflin (Pennsylvania)

Fort Mifflin
Colonial · 1.2 mi
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All battles in Pennsylvania
Source

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

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