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Oswego in Oswego County, New York — The American Northeast (Mid-Atlantic)
 

Fort Ontario in the American Revolution

 
 
Fort Ontario in the American Revolution Marker image. Click for full size.
Photographed by Steve Stoessel, July 23, 2025
1. Fort Ontario in the American Revolution Marker
Inscription.

Igniting the Powder Keg, 1765 - 1775
By 1770, the financially strapped British government had abandoned Fort Ontario and most other Great Lakes frontier army posts. Unlike after earlier colonial wars, the regular troops did not all return to Europe. Instead, they were shifted - mainly to seacoast towns. After Parliament passed the Quartering Act of 1765, which made colonial legislatures responsible for providing barracks or paying for other accommodations to house British regulars, tensions between soldiers and resentful civilians rose.

In 1774, following the infamous Boston Tea Party, Parliament passed four acts known as the Coersive Acts, which took away Massachusetts' ability to self-govern. The last of these was another Quartering Act, which affected all American colonies; it allowed Royal Governors, rather than colonial legislatures, to use unoccupied houses, outhouses, barns, or other buildings to quarter British soldiers. Collectively nicknamed the "Intolerable Acts" by enraged American colonists, they sparked the opening hostilities of the Revolutionary War at Lexington and Concord, Massachusetts on April 19,
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1775.

In Defense of King and Parliament, 1775
Shortly after the outbreak of the American Revolution, Fort Ontario became a place of temporary shelter for refugees who remained loyal to the crown, as their rebel neighbors in the Mohawk Valley forced them to flee. The exodus of Loyalists through Fort Ontario during the war led to many new settlements along the north shore of Lake Ontario and the Niagara frontier.

In June 1775, British Indian Superintendent Colonel Guy Johnson called a conference of Haudenosaunee leaders at Fort Ontario. Over 1300 Haudenosaunee listened to Johnson's plea for help against the rebels, but they failed to give him their united support. Some Mohawks, led by Joseph Brant, followed Johnson to Canada when the conference closed on July 8, 1775. The Haudenosaunee were divided in their support of Crown and rebel adherents. Both sides made it difficult for the Haudenosaunee to remain neutral without consequence, and yet neither side's success seemed promise victory for the Haudenosaunee.

All the King's Men, 1777
British campaign in 1777 planned to exploit the waterways of New York and seemed to
Left Side of Marker image. Click for full size.
Photographed by Steve Stoessel, July 23, 2025
2. Left Side of Marker
promise the opportunity for British victory. Brigadier General Barry St. Leger was to move from Fort Ontario along the Oswego-Oneida-Mohawk river-route toward Albany. There he was to meet the larger British force under Lt. General John Burgoyne that was coming south through the Lake Champlain gateway and down the Hudson Valley, and other forces moving up the Hudson River from New York City.

St. Leger's mixed force of British regulars, Loyalist and Canadian auxiliaries, Hessian Jδger Corps, and allied Haudenosaunee forces left Fort Ontario on July 26, but encountered unexpectedly stiff resistance at rebel-held Fort Schuyler. After a hard-fought battle near Oriskany on August 6 and after failing to compel the surrender of Fort Schuyler with days of bombardment, St. Leger quit his siege and returned to Fort Ontario on August 26. He gathered the Fort's garrison and artillery and retreated to Canada. Continental troops from Fort Schuyler returned to Fort Ontario's abandoned buildings in July of 1778.

Rebuilding & the Last Campaign, 1782 - 1783
Governor-general of Canada Major General Frederick Haldimand was aware of Oswego's strategic
Middle Section of Marker image. Click for full size.
Photographed by Steve Stoessel, July 23, 2025
3. Middle Section of Marker
importance and, under pressure from the Haudenosaunee, ordered Major John Ross to rebuild and garrison Fort Ontario in April 1782. Lt. General George Washington, concerned that reconstruction of Fort Ontario might be a prelude to another invasion of the Mohawk Valley, instructed Colonel Marinus Willet to undertake a surprise winter attack against the post.

Under the severe conditions of driving snow, wind, extreme cold, and darkness, Willet's Oneida guide became lost. At sunrise on February 12th, 1783, the attacking party of New York Levies and the Rhode Island Regiment - made up of mostly Black soldiers - emerged from the woods at a significant distance, but visible from the fort. Having lost the essential element of surprise, Willet and his frozen troops returned to the Mohawk Valley. It was the last Continental Army campaign of the Revolutionary War.

American Sovereignty at Last, 1783 - 1796
On September 3, 1783, Congress signed the Treaty of Paris, ending the American Revolution. Great Britain formally recognized the United States as an independent nation, but they still held Fort Ontario and six other "Northwest Posts" from
Right Side of Marker image. Click for full size.
Photographed by Steve Stoessel, July 23, 2025
4. Right Side of Marker
Lake Champlain to the Straits of Mackinac 13 years after the war ended. Britain hoped that American independence would collapse. They used the posts as bargaining chips during negotiations for compensation of seized loyalist property.

While they held Fort Ontario, British troops did not allow Americans to settle near the mouth of the Oswego River. British customs officers imposed stiff duties on American cargoes of salt from Salina shipped down the river. A Continental Army veteran living at Oswego Falls (now Fulton) was a paid informer and alerted Fort Ontario's commandant to settler's activities and the approach of shipments.

It was not until the 1794 Jay Treaty that United States troops under Captain James Bruff replaced Fort Ontario's last British garrison on July 14, 1796. An observer wrote, "I have the pleasure of informing you that the American flag, under a Federal salute, was for the first time displayed from the citadel of this fort, at the hour of ten this morning."
 
Topics. This historical marker is listed in these topic lists: Forts and CastlesWar, US Revolutionary. A significant historical date for this entry is February 12, 1783.
 
Location. 43° 27.863′ N,
Fort Ontario in the American Revolution Marker image. Click for full size.
Photographed by Steve Stoessel, July 23, 2025
5. Fort Ontario in the American Revolution Marker
76° 30.43′ W. Marker is in Oswego, New York, in Oswego County. It is on McRobie Ball Field Street 0.1 miles north of Barbara Donahue Drive, on the left when traveling north. Marker is at the parking area by the path that leads to the fort entrance. Touch for map. Marker is in this post office area: Oswego NY 13126, United States of America. Touch for directions.

Regionally, this marker is in Upstate New York, specifically in Central New York, and in the Syracuse Metropolitan Area. It is also in the American Northeast, on the Great Lakes, and in the Mid-Atlantic. Globally, it is in the North Atlantic Region, North America, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once New Netherland and also one of the original Thirteen Colonies.

Other nearby markers. At least 8 other markers are within walking distance of this marker: Prideaux's Campaign (a few steps from this marker); Fort Ontario in World War I (a few steps from this marker); The Post Ghost (within shouting distance of this marker); African Troops at Fort Ontario (within shouting
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distance of this marker); Fort Ontario (about 500 feet away, measured in a direct line); Earthworks and Officer's Row at Fort Ontario (about 600 feet away); Holocaust Survivors (approx. Ό mile away); Fort Ontario State Historic Site (approx. Ό mile away). Touch for a list and map of all markers in Oswego.
 
 
Credits. This page was last revised on August 9, 2025. It was originally submitted on August 9, 2025, by Steve Stoessel of Niskayuna, New York. This page has been viewed 127 times since then and 34 times this year. Photos:   1, 2, 3, 4, 5. submitted on August 9, 2025, by Steve Stoessel of Niskayuna, New York.
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Jul. 8, 2026