1) In the late 9th century, a large Danish army invaded England after being defeated in France. They crossed the English Channel with 250 ships. 2) King Alfred the Great ruled Wessex from 871-901 AD and led resistance against the Danish invaders. He defeated them in the crucial Battle of Edington in 878. 3) After the battle, Alfred negotiated the Peace of Chippenham, in which the Danes controlled northern and central England while Alfred ruled southern England from Wessex. This divided England between the warring parties.