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| St. Leger expedition | |
|---|---|
| Date | August–October 1777 |
| Place | Ontario County, Mohawk Valley, Lake Ontario, Fort Stanwix |
| Result | Strategic withdrawal; relief of Fort Stanwix; impact on Saratoga campaign |
| Strength1 | ~800–1,000 |
| Strength2 | ~500–700 |
| Casualties1 | various killed, wounded, captured |
| Casualties2 | various killed, wounded, captured |
St. Leger expedition was a 1777 British-Indian campaign during the American Revolutionary War intended to advance from Lake Ontario into the Mohawk Valley to seize Fort Stanwix and join forces for the Saratoga campaign. Led by British officer Barry St. Leger and supported by officers from the British Army, Royal Navy, and British Indian Department, the force combined regulars, Loyalists, and several Iroquois nations. The expedition's failure contributed to the isolation and eventual surrender of John Burgoyne at Saratoga, altering diplomatic and military momentum in favor of the United States and encouraging intervention by France.
The expedition originated from strategic designs by John Burgoyne and Lord George Germain to sever the New England colonies from the middle Atlantic by controlling the Hudson River corridor, the Mohawk River, and the Lake Champlain and Lake Ontario waterways. British planners in London coordinated with officers from the War Office, the Board of Ordnance, and the Adjutant General's Office to muster an overland and riverine thrust intended to link with Burgoyne's main thrust from Quebec. The campaign drew upon Native alliances negotiated by officials such as Sir William Johnson, representatives of the Indian Department, and chiefs from the Mohawk, Seneca, Onondaga, and Cayuga nations. American strategic responses involved commanders including Philip Schuyler, Horatio Gates, and militia leaders like Nicholas Herkimer, who mobilized Tryon County and Schenectady militia to defend the Mohawk Valley.
Planning meetings occurred at Oswego, Fort Niagara, and among British staff officers coordinating river transport through the St. Lawrence River and Oneida Lake. St. Leger assembled a force that drew on companies from the 4th Regiment of Foot, 8th Regiment of Foot, and Loyalist units such as DeLancey's Brigade, alongside rangers from the Queen's Rangers and raiders from Burgoyne's Native auxiliaries. Recruiting leveraged intermediaries like Guy Johnson, Sir John Johnson, and agents of the Indian Department to secure warriors from the Six Nations, led by figures such as Joseph Brant and Cornplanter. Logistics planning involved officers from the Ordnance Department and contractors in Montreal for bateaux, provisions, and artillery pieces destined for the Oswego River route.
The expedition moved from Oswego along the Oswego River to Oneida Lake, down the Oneida River and Oswego Creek toward the Mohawk River corridor, then overland on portage roads toward Fort Stanwix near present-day Rome, New York. Naval assets included bateaux and schooners provided through Lake Ontario staging points and salvage from Fort Ontario. Supply constraints, difficult portages, and seasonal conditions taxed lines maintained from Montreal and Niagara. Coordination with Loyalist and Native contingents was complicated by differing logistical cultures among units such as King's Royal Regiment of New York and bands of Iroquois warriors, while communications were influenced by couriers between Albany, Saratoga, and forward camps.
Early operations featured skirmishes with New York militia and reconnaissance clashes involving scouts from Fort Stanwix and patrols led by Loyalist officers. Notable small actions included ambushes on supply convoys near Caughnawaga and raiding parties against frontier settlements in German Flats and Canajoharie. Native raids coordinated with British regulars targeted Tryon County homesteads and engaged militia under commanders such as Herkimer and Peter Gansevoort. Artillery duels and sapper work occurred during the siege operations around Fort Stanwix, where engineers and artillerymen from the Royal Artillery attempted to breach defenses while militia sorties interdicted siege lines.
As the siege developed, news of Burgoyne's setbacks in the Hudson River valley and the engagement at Bennington altered strategic calculations, while militia forces under Herkimer and detachments from Schoharie and Palatine counties converged to relieve Gansevoort's garrison. St. Leger confronted a rising opposition in the field when a disparate relief column fielded by Herkimer and augmented by Mohawk allies approached along the Mohawk River corridor. Intelligence failures, desertions among Loyalist elements, and diplomatic frictions with Native leaders like Brant undercut the cohesion of St. Leger's force shortly before the decisive engagement at Oriskany that shaped the siege's outcome.
The withdrawal from the siege of Fort Stanwix after the confrontation at Oriskany and the arrival of militia relief had immediate operational consequences: St. Leger's retreat opened the Mohawk Valley to Patriot control and prevented linkage with Burgoyne's army, contributing to Burgoyne's isolation and eventual surrender at Saratoga—a turning point that encouraged recognition and military support from France and later from Spain and the Dutch Republic. The expedition influenced Native relations, prompting realignments among Iroquois nations, abuses that fueled frontier reprisals by figures like John Butler and Guy Johnson, and legislative responses in the Continental Congress addressing frontier defense and refugee relief.
Historians have evaluated the expedition in the contexts of British grand strategy, colonial frontier warfare, and Indigenous diplomacy, with scholars referencing archives from The National Archives (UK), the New York State Archives, and correspondence involving Lord Germain and Burgoyne. Interpretations by historians such as John R. Alden, Beatson Clark, Richard Ketchum, and Ruth Putnam emphasize logistical overreach, intelligence shortcomings, and the limits of Native-British coordination. The campaign features in studies of the American Revolution's northern theater, the diplomatic aftermath culminating in the Treaty of Alliance (1778), and preservation efforts at sites like Fort Stanwix National Monument and regional museums in Oneida County. The expedition's legacy endures in research on colonial frontier violence, Loyalist migrations to Nova Scotia and Upper Canada, and commemorations in local histories across the Mohawk Valley.
Category:Battles of the American Revolutionary War Category:1777 in the United States Category:Native American history