"One expert said the treasure found by 55-year-old Terry Herbert would revolutionize understanding of the Anglo-Saxons, a Germanic people who ruled England from the fifth century until the Norman conquest in 1066. Another said the find would rank among Britain's best-known historic treasures." It looks like they were in power for about 500 years, then.
Anglo-Saxons (or Anglo-Saxon) is the term usually used to describe the invading tribes in the south and east of Great Britain from the early 5th century AD, and their creation of the English nation, to the Norman conquest of 1066. The Benedictine monk, Bede, identified them as the descendants of three Germanic tribes: 
The Angles, who may have come from Angeln, and Bede wrote that their whole nation came to Britain,  leaving their former land empty. The name 'England' or 'Aenglaland' originates from this tribe. 
The Saxons, from Lower Saxony (German: Niedersachsen, Germany)
The Jutes, from the Jutland peninsula.
From the Wikipedia comes further information on the Normans. "The Norman conquest of England or 'The Conquest' began in 1066 with the invasion of the Kingdom of England by the troops of William, Duke of Normandy ('William the Conqueror' or 'William the Bastard'), and his victory at the Battle of Hastings. This resulted in Norman control of England, which was firmly established during the next few years. The Norman Conquest was a pivotal event in English history for several reasons. It largely removed the native ruling class, replacing it with a foreign, French-speaking monarchy, aristocracy, and clerical hierarchy. This in turn brought about a transformation of the English language and the culture of England."
Where was Normandy? Normandy (French: Normandie, Norman: Normaundie) is a geographical region corresponding to the former Duchy of Normandy. It is situated along the English Channel coast of Northern France between Brittany (to the west) and Picardy (to the east) and comprises territory in northern France and the Channel Islands.
To sum this up, dna can be from the Anglo Saxon Germans to the French in the English people. We'll so find out what our Henwood family shows for its beginnings.