High Quality Content by WIKIPEDIA articles! 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 what is present-day 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.