The French had opened siege trenches and …

Years: 1756 - 1756
August
The French had opened siege trenches and begun working toward Fort Ontario on the night of August 11–12.

The fort's defenders exchange cannon and gunfire with the French colonists and natives until late in the day on August 13, at which point, under orders from Mercer, they abandon the fort even before the siege trenches have reached their goal.

Immediately capitalizing on this, Montcalm occupies the fort and begins the construction of batteries on the western edge of the height, where they can reach Fort Oswego's exposed east side.

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