Captain William Trent

From The Plains of Abraham by Brian Connell:

"As a stop-gap, Dinwiddie persuaded a frontiersman, Captain William Trent, to recruit a hundred men from among his fellow Indian traders. ..they were packed off post-haste to start constructing a fort on the neck of land between the Allegheny and Monongahela rivers."

Source

"In August, 1753, he (Trent) was directed by Governor Dinwiddie, to examine the site selected by the commissioners, in 1752, for a fort on the Ohio. This was at the forks of the Ohio, where Pittsburg now stands. In a letter from John Frazier to an Indian trader named Young, dated "Forks, August 27, 1753," we find the following reference to Trent: "There is hardly any Indians now here at all, for yesterday there set off along with Captain Trent...".

Early in January, 1754, Governor Dinwiddie commissioned Trent to raise one hundred men for immediate service on the frontier. By the last of the month this force was raised, and immediately

marched to the mouth of Redstone creek, where a temporary store house was erected for the Ohio company, in which to place articles and supplies, to be carried from thence to the mouth of the Monongahela. While at Redstone, the Captain received instructions from Governor Dinwiddie to build a fort at the forks of the Monongahela and Ohio... .

Fort Pitt and Redstone On Map (Source) (Also seen here)

On the 17th the fort was given up, but not until highly honorable terms were obtained from the enemy. At this time, a Virginia regiment under Col. Fry, with George Washington as lieutenant colonel, was at Wills creek, Maryland, on its way to the forks. 

...the French enlarged and completed the fort, and named it Fort Du Quesne, in honor of the governor of Canada.