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.

Lieutenant Colonel George Washington was leading an expedition to meet up with a group of Frontiersmen who had set out a few months earlier in order to build a fort. On his way, Washington received word that a French party of 50 soldiers was in the area. Fearing they may be a raiding party, Washington ambushed them, and nearly every Frenchmen was killed or captured. This skirmish would prove to be the opening shots of the Seven Years War.