Orkney period, are from the Sagas.

Much controversy has raged over the sites of Ethandune and the
landing place of Hubba at Kynwith Castle, owing probably to the
duplication of names in the district where the last campaign took
place. The story, therefore, follows the identifications given by
the late Bishop Clifford in "The Transactions of the Somerset
Archaeological Society" for 1875 and other years, as, both from
topographic and strategic points of view, no other coherent
identification seems possible.

The earthworks of the Danish position still remain on Edington
hill, that looks out from the Polden range over all the country of
Alfred's last refuge, and the bones of Hubba's men lie everywhere
under the turf where they made their last stand under the old walls
and earthworks of Combwich fort; and a lingering tradition yet
records the extermination of a Danish force in the neighbourhood.
Athelney needs but the cessation of today's drainage to revert in a
very few years to what it was in Alfred's time--an island, alder
covered, barely rising from fen and mere, and it needs hut little
imagination to reproduce what Alfred saw when, from the same point
where one must needs be standing, he planned the final stroke that
his people believed was inspired directly from above.

It would seem evident from Alfred's method with Guthrum that he
realized that this king was but one among many leaders, and not
directly responsible for the breaking of the solemn peace sworn at
Exeter and Wareham. His position as King of East Anglia has gained
him an ill reputation in the pages of the later chronicles; but
neither Asser nor the Anglo-Saxon Chronicle--our best authorities--