What led to braddock's defeat at battle of the Monongahela or the battle of wilderness July 9 1755?

Braddock's defeat at the Battle of the Monongahela on July 9, 1755, was primarily due to his underestimation of the French and their Native American allies, as well as his rigid adherence to traditional European military tactics. His forces were ambushed while crossing the Monongahela River, and the lack of effective reconnaissance contributed to their surprise. Additionally, the terrain favored the guerrilla warfare employed by the French and Native Americans, overwhelming Braddock's troops, leading to a disastrous defeat and heavy casualties.