Fort Duquesne .-- Instead of heeding Dinwiddie's warning, the French set to work to build Fort Duquesne (Due-kan') at the spot where the Alleghany and Monongahela join to form the Ohio,--on the site of the present city of Pittsburg.

Dinwiddie therefore sent Washington with a small force of soldiers to drive them away.

But the French were too strong for Washington.

They besieged him in Fort Necessity and compelled him to surrender (July 4, 1754).
[Illustration: BRADDOCK'S CAMPAIGN.] [Sidenote: Braddock's expedition, 1755.

_Higginson_, 152-154; _Eggleston_, 129-131; _Source-book_, 103-105.] 99.