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French and Indian War

In February 1754, Dinwiddie promoted Washington to lieutenant colonel and second-in-command of the 300-strong Virginia Regiment, with orders to confront French forces at the Forks of the Ohio. Washington set out with half the regiment in April and soon learned a French force of 1,000 had begun construction of Fort Duquesne there. In May, having set up a defensive position at Great Meadows, he learned that the French had made camp seven miles (11 km) away; he decided to take the offensive.

The French detachment proved to be only about 50 men, so Washington advanced on May 28 with a small force of Virginians and Indian allies to ambush them. During the ambush, French forces were killed outright with muskets and hatchets, including French commander Joseph Coulon de Jumonville, who had been carrying a diplomatic message for the British. The French later found their countrymen dead and scalped, blaming Washington, who had retreated to Fort Necessity.

The full Virginia Regiment joined Washington at Fort Necessity the following month with news that he had been promoted to command of the regiment and colonel upon the regimental commander's death. The regiment was reinforced by an independent company of a hundred South Carolinians led by Captain James Mackay; his royal commission outranked Washington's and a conflict of command ensued. On July 3, a French force attacked with 900 men, and the ensuing battle ended in Washington's surrender. He signed a surrender document in which he unwittingly took responsibility for "assassinating" Jumonville, later blaming the translator for not properly translating it.

In the aftermath, Colonel James Innes took command of intercolonial forces, the Virginia Regiment was divided, and Washington was offered a captaincy in one of the newly formed regiments. He refused, however, as it would have been a demotion and instead resigned his commission. The "Jumonville affair" became the incident which ignited the French and Indian War, later to become part of the Seven Years' War.

In 1755, Washington served voluntarily as an aide to General Edward Braddock, who led a British expedition to expel the French from Fort Duquesne and the Ohio Country. On Washington's recommendation, Braddock split the army into one main column and a lightly equipped "flying column". Suffering from severe dysentery, Washington was left behind, and when he rejoined Braddock at Monongahela the French and their Indian allies ambushed the divided army. Two-thirds of the British force became casualties, including the mortally wounded Braddock. Under the command of Lieutenant Colonel Thomas Gage, Washington, still very ill, rallied the survivors and formed a rear guard, allowing the remnants of the force to disengage and retreat.

During the engagement, he had two horses shot from under him, and his hat and coat were bullet-pierced. His conduct under fire redeemed his reputation among critics of his command in the Battle of Fort Necessity, but he was not included by the succeeding commander (Colonel Thomas Dunbar) in planning subsequent operations.

The Virginia Regiment was reconstituted in August 1755, and Dinwiddie appointed Washington its commander, again with the rank of colonel. Washington clashed over seniority almost immediately, this time with John Dagworthy, another captain of superior royal rank, who commanded a detachment of Marylanders at the regiment's headquarters in Fort Cumberland. Washington, impatient for an offensive against Fort Duquesne, was convinced Braddock would have granted him a royal commission and pressed his case in February 1756 with Braddock's successor as Commander-in-Chief, William Shirley, and again in January 1757 with Shirley's successor, Lord Loudoun. Shirley ruled in Washington's favor only in the matter of Dagworthy; Loudoun humiliated Washington, refused him a royal commission and agreed only to relieve him of the responsibility of manning Fort Cumberland.

In 1758, the Virginia Regiment was assigned to the British Forbes Expedition to capture Fort Duquesne. Washington disagreed with General John Forbes' tactics and chosen route. Forbes nevertheless made Washington a brevet brigadier general and gave him command of one of the three brigades that would assault the fort. The French had abandoned the fort and the valley before the assault, however, and Washington only saw a friendly fire incident which left 14 dead and 26 injured. Frustrated, he resigned his commission soon afterwards and returned to Mount Vernon.

Under Washington, the Virginia Regiment had defended 300 miles (480 km) of frontier against twenty Indian attacks in ten months. He increased the professionalism of the regiment as it grew from 300 to 1,000 men, and Virginia's frontier population suffered less than other colonies. Though he failed to realize a royal commission, he gained self-confidence, leadership skills, and knowledge of British military tactics. The destructive competition Washington witnessed among colonial politicians fostered his later support of a strong central government.