Watch The Viking Invasion of Wessex 878 AD (2009) : Full Movie Online Free The Viking Invasion of Wessex 878 AD is the second DVD in this sensational new series, The Dark Ages, which delves into a war-torn and obscure period of Britain's past to focus on some of the pivotal events that completely altered the history, culture and politics of the British Isles. In the year 878 AD, Alfred King of Wessex faced the fourth and most serious attempt by the devious Viking chieftain Guthrum to seize the last remaining Saxon kingdom. Thwarted in their conventional attempts in 871, 876 and 878, the Vikings, stole away from their base in Gloucester and descended on Alfred's court while they were celebrating Twelfth Night on the borders of wintery Wessex at Chippenham. Alfred escaped but was driven into hiding in the Somerset Marshes, while the Vikings fanned across Wessex.