In 1755, Washington became the senior American aide to British General Edward Braddock on the ill-fated Braddock expedition. This was the largest British expedition to the colonies, and was intended to expel the French from the Ohio Country; the first objective was the capture of Fort Duquesne. Washington initially sought an appointment as a major from Braddock, but he agreed to serve as a staff volunteer upon advice that no rank above captain could be given except by London. During the passage of the expedition, Washington fell ill with severe headaches and fever. He recommended to Braddock that the army be split into two divisions when the pace of the troops continued to slow: a primary and more lightly equipped "flying column" offensive which could move at a more rapid pace, to be followed by a more heavily armed reinforcing division. Braddock accepted the recommendation (likely made in a council of war including other officers) and took command of the lead division.  In the Battle of the Monongahela, the French and their Indian allies ambushed Braddock's reduced forces and the general was mortally wounded. After suffering devastating casualties, the British panicked and retreated in disarray. Washington rode back and forth across the battlefield, rallying the remnants of the British and Virginian forces into an organized retreat. In the process, he demonstrated bravery and stamina, despite his lingering illness. He had two horses shot from underneath him, while his hat and coat were pierced by several bullets. Two-thirds of the British force of 976 men were killed or wounded in the battle. Washington's conduct in the battle redeemed his reputation among many who had criticized his command in the Battle of Fort Necessity.  Washington was not included by the succeeding commander Col. Thomas Dunbar in planning subsequent force movements, whatever responsibility rested on him for the defeat as a result of his recommendation to Braddock.

Answer this question "What happen in 1755" by extracting the answer from the text above.
Washington became the senior American aide to British General Edward Braddock on the ill-fated Braddock expedition.