Is the biggest march in English history a myth? My research shows King Harold sailed down to the battle of Hastings

In 1066, England was invaded by multiple foreign powers. A northern force led by King Harald Hardrada of Norway advanced on York via the River Humber, while a southern force, led by Duke William of Normandy (later William I the Conqueror) crossed the Channel with forces from Normandy, France, Brittany and Ponthieu, and took up position at Hastings.