Viking ring fortress might have launched English invasion

Danish Archaeologists, thrilled by the discovery of a Viking ring fortress on the island of Zealand, are considering the possibility that the site might have been used as a training camp to launch an invasion of England. (photo)

Built in the time of Harald Bluetooth or his son Sweyn Forkbeard, the first Danish King of England, the distinctive, circular-shaped earthen work "consists of a 35-foot wide circular rampart surrounded by a palisade of wooden spikes."

“This is great news,” said Lasse Sonne, a Viking historian from the Saxo Institute at the University of Copenhagen. “Although there were Vikings in other countries, these circular fortresses are unique to Denmark."