The Battle of Willow Creek, also occasionally referred to as the Battle of the Willows, was an engagement from September 2-5, 1952 that was the first major American engagement in the Welsh Campaign of the English Adventure in an uninhabited region of central Wales. The American XI Corps encountered the Irish Regulars 5th Division at a place the locals referred to as the Willows due to a propensity of willow trees in a low valley, and the Irish were soon thereafter reinforced by a small force of EWA forces.