UK History: Chapter 3, Exercise 3 — Possible Solution
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WHAT THE SOURCES CANNOT TELL YOU
The first raids, the arrival of the Great Heathen Army, the Battle of Ashdown,
the boundaries of the Danelaw, and the events between 899 and 924.

SOURCE TO LOOK FOR
A specialized history of the Viking Age in England, and the Anglo-Saxon
Chronicle itself, which the chapter says Alfred commissioned. The Chronicle is
a primary source but needs care, since it was compiled by the West Saxon
court.