On this date in 1066, William of Normandy, soon to be known as William the Conqueror, crossed the English Channel with his Norman knights, landing near Pevensey. On October 14, the Normans defeated Harold II‘s Saxon infantry-based army at Hastings. England hasn’t been the same since.
By the way, 1066 and all that is a hysterically funny book about British students’ manglings of their history. Indispensable reading!