US ResearchConflictsColonial and Pre-ColumbianBattle of the Monongahela - Grant's Defeat 1758
Colonial and Pre-Columbian

Battle of the Monongahela - Grant's Defeat 1758

1755
Pennsylvania
Era
Colonial and Pre-Columbian
Year
1755
Location
Pennsylvania
Status
Historical record
The Combatants

Who Fought

Defeated
British
Forces
French and Native American allies: led by François-Marie Le Marchand de Lignery (strength unknown)
VS
Victor
French/Delaware
Forces
British: 850 men under Major James Grant of Ballindalloch of the 77th Regiment
Outcome
The British force was out-maneuvered, surrounded, and largely destroyed by the French and their native allies led by François-Marie Le Marchand de Lignery.
The Battle

History & Significance

In July 1758, during the French and Indian War, the British organized a large-scale expedition with 6,000 troops led by General John Forbes to drive the French from the contested Ohio Country and clear a path for an invasion of Canada. The expedition included a contingent of Virginians commanded by George Washington. As the force advanced slowly through the wilderness, a road was constructed with forts and redoubts built every forty miles. Forbes, who was very ill, entrusted command of the advancing army to his second in command, Lt. Col. Henry Bouquet, a Swiss officer commanding a battalion of the Royal American Regiment.

By late August, as the British approached Fort Duquesne, Bouquet authorized Major James Grant of Ballindalloch of the 77th Regiment to reconnoiter the area with 850 men. On September 11, 1758, Grant led these men to scout the region near the French-controlled fort. The British force was out-maneuvered and surrounded by the French and their Native American allies, who were led by François-Marie Le Marchand de Lignery.

The engagement on September 14, 1758, proved disastrous for the British. The force was largely destroyed in what became known as the Battle of Fort Duquesne, representing a significant setback to British operations in the Ohio Country. This defeat demonstrated the effectiveness of French and Native American defensive tactics and the challenges the British faced in conducting wilderness warfare during their broader campaign to control the contested frontier territories of North America.

Historical context

European colonization of North America accelerated after 1600, with England, France, Spain, and the Netherlands establishing competing settlements along the Atlantic coast, the St. Lawrence River, the Gulf of Mexico, and the Mississippi Valley. The first permanent English settlement at Jamestown, Virginia (1607) struggled with starvation and conflict; the Plymouth colony (1620) and the Massachusetts Bay Colony (1630) followed. By the mid-1700s, thirteen English colonies stretched along the Atlantic seaboard, governed through a mix of royal charters, proprietary grants, and elected assemblies. The colonial economy depended on tobacco in Virginia and Maryland, rice and indigo in the Carolinas, and maritime trade in New England — all increasingly reliant on enslaved African labor after 1619. Conflict with Indigenous peoples over land was continuous, punctuated by major wars including King Philip's War (1675–1676) in New England and the Yamasee War (1715–1717) in the South. The French and Indian War (1754–1763), part of the global Seven Years' War, ended French power in North America and left Britain deeply in debt — triggering the taxation disputes that would lead to revolution.

Casualties & Losses

{"british":"~300 killed","french_native":"moderate"}

Questions & Answers

Frequently Asked Questions

When did Battle of the Monongahela - Grant's Defeat 1758 take place?
Battle of the Monongahela - Grant's Defeat 1758 took place in 1755.
Where was Battle of the Monongahela - Grant's Defeat 1758 fought?
Battle of the Monongahela - Grant's Defeat 1758 was fought in Pennsylvania, United States.
What was the outcome of Battle of the Monongahela - Grant's Defeat 1758?
The British force was out-maneuvered, surrounded, and largely destroyed by the French and their native allies led by François-Marie Le Marchand de Lignery.
What was the significance of Battle of the Monongahela - Grant's Defeat 1758?
In July 1758, during the French and Indian War, the British organized a large-scale expedition with 6,000 troops led by General John Forbes to drive the French from the contested Ohio Country and clear a path for an invasion of Canada. The expedition included a contingent of Virginians commanded by
More from this era

Other Colonial and Pre-Columbian Engagements

Lenape-Susquehannock Conflicts
1600
Pennsylvania
Swedish-Lenape Tinicum Conflict
1643
Pennsylvania
Erie Tribe Destruction
1654
Pennsylvania
Battle of the Brandywine (Colonial)
1690
Pennsylvania
Action at Fort Le Boeuf (Washington, 1753)
1753
Pennsylvania
Jumonville Glen Skirmish 1754
1754
Pennsylvania
Fort Necessity — Battle of Jumonville 1754 Context
1754
Pennsylvania
Battle of Fort Necessity — Second Day (1754)
1754
Pennsylvania
Battle of Jumonville Glen 1754
1754
Pennsylvania
Battle of Fort Necessity approaches / Great Meadows
1754
Pennsylvania
Battle of Fort Necessity - French perspectives
1754
Pennsylvania
Capture of Fort Trent (Forks of Ohio)
1754
Pennsylvania
Battle of Jumonville Glen
1754
Pennsylvania
Battle of Fort Necessity (Entrenching)
1754
Pennsylvania
Battle of Fort Necessity July 3 1754
1754
Pennsylvania
Jumonville Affair at Great Meadows 1754
1754
Pennsylvania
All battles in Pennsylvania
Source

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

Aubrey Research

Explore the history around Pennsylvania

Aubrey generates in-depth historical research for any location in the US, drawing on NRHP records, battlefield archives, census history and geological data to tell the full story of a place.

Research a location near PennsylvaniaView a free sample report
All Colonial and Pre-Columbian Battles