After retiring from Jumonville, Washington expected to be attacked.
Tanacharison attempted to convince the Lenape, Shawnee and the Mingo Indians to join the Virginians at Great Meadows.
With about 150 Virginians at Great Meadows, they began to construct a fort, which Washington named Fort Necessity.
The fort was completed on June 3.

By June 9, the rest of the Virginia Regiment arrived at Great Meadows, excluding Colonel Joshua Fry, who had fallen from his horse, broken his neck and died.
Washington took his place as colonel.
A few days later, 100 British regulars under the command of James Mackay arrived, but, instead of making camp with the Virginians, they camped separately outside the fort.
After retiring from Jumonville, Washington expected to be attacked. Tanacharison attempted to convince the Lenape, Shawnee and the Mingo Indians to join the Virginians at Great Meadows. With about 150 Virginians at Great Meadows, they began to construct a fort, which Washington named Fort Necessity. The fort was completed on June 3.
By June 9, the rest of the Virginia Regiment arrived at Great Meadows, excluding Colonel Joshua Fry, who had fallen from his horse, broken his neck and died. Washington took his place as colonel. A few days later, 100 British regulars under the command of James Mackay arrived, but, instead of making camp with the Virginians, they camped separately outside the fort.
Battle of Fort Necessity