It began Process_start with a dispute over control of the confluence of the Allegheny River and Monongahela River called the Forks of the Ohio , and the site of the French Fort Duquesne in Pittsburgh , Pennsylvania .

None succeeded , and the main effort by Braddock proved a disaster ; he lost Earnings_and_losses the Battle of the Monongahela on July 9 , 1755 and died Death a few days later .