The Battle of Jumonville Glen, also known as the Jumonville affair, was the opening battle of the French and Indian War, fought on May 28, 1754, near present-day Hopwood and Uniontown in Fayette County, Pennsylvania. A company of colonial militia from Virginia under the command of Lieutenant Colonel George Washington, and a small number of Mingo warriors led by Tanacharison (also known as "Half King"), ambushed a force of 35 Canadiens under the command of Joseph Coulon de Villiers de Jumonville.
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 to colonel upon the death of the regimental commander. The regiment was reinforced by an independent company of 100 South Carolinians led by Captain James Mackay, whose royal commission outranked that of Washington, and a conflict of command ensued. On July 3, a French force attacked with 900 men, and the ensuing battle (Battle of Fort Necessity) ended in Washington's surrender. In the aftermath, Colonel James Innes took command of intercolonial forces, the Virginia Regiment was divided, and Washington was offered a captaincy which he refused, with resignation of his commission.