The Great Danish Army or The Great Viking Army , known by the Anglo-Saxons as the Great Heathen Army ( OE : mycel heathen here ) , was a group of hitherto uncoordinated bands of vikings that originated from Denmark , Norway and Sweden who came together under a unified command to invade the four Anglo-Saxon kingdoms that constituted England in 865 AD .
The Great Heathen Army , also called the Great Danish Army or The Great Viking Army , was a large force of Danish Vikings that attacked Anglo-Saxon England .