Harold II marched his exhausted army south after crushing a Viking invasion at Stamford Bridge, only to face William of Normandy's forces on Senlac Hill. After a day of shield-wall combat and feigned retreats, an arrow reportedly struck Harold, and his line broke. William's victory installed a Norman aristocracy that transformed England's language, architecture, and governance for centuries.
The battle began around 9 a.m. and ground on for hours, an unusually long engagement for medieval warfare. Harold's housecarls held the high ground behind a shield wall so disciplined that Norman cavalry charges repeatedly failed to break it. William's forces feigned retreat several times, luring Saxon soldiers to break formation in pursuit, a tactic that gradually thinned Harold's line.
Legend holds that Harold died with an arrow through his eye, an image immortalized in the Bayeux Tapestry, though contemporary accounts differ on exactly how he fell. What's certain is that by dusk, England's king lay dead and his army scattered into the darkening countryside.
William the Conqueror's victory did far more than change England's ruling family. Old English absorbed thousands of Norman French words, common law began to fuse with continental practices, and a wave of castle and cathedral building transformed the landscape. Few single afternoons in European history reshaped a nation so thoroughly.