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BATTLE // August 3, 1757

Siege of Fort William Henry

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Overview

The siege of Fort William Henry was conducted by a French and Indian force led by Louis-Joseph de Montcalm against the British-held Fort William Henry. This fort, located at the southern end of Lake George, on the frontier between the British Province of New York and the French Province of Canada, was garrisoned by a poorly supported force of British regulars and provincial militia led by Lieutenant Colonel George Monro.

Overview adapted from Wikipedia, licensed under CC BY-SA 4.0.

Significance

The Siege of Fort William Henry, conducted by Montcalm with a French and Indian force of 6,200 against a British garrison of 2,500 under Lieutenant Colonel George Monro, was a significant French offensive action on the contested frontier between the British Province of New York and the French Province of Canada during the Seven Years' War. Fort William Henry sat at the southern end of Lake George, a position that made it a key point of control on the corridor between the two colonial territories. British casualties of 2,308 out of a defending force of 2,500 indicate that the garrison was effectively destroyed as a fighting force. Monro's force was described as poorly supported, underscoring the exposed character of the British position on this frontier at the time of the siege. The fall of the fort represented a significant French success in the North American theater, removing a British stronghold on the Lake George corridor and extending French operational reach into the New York frontier.

Forces & casualties

Troop strength

  • France6,200
    medium
  • Great Britain2,500
    medium

France fielded a 2.5 : 1 numerical advantage

Casualties

  • Great Britain2,308
    medium92% loss rate

Commanders (4)

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Last verified July 2026
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