Thetford Viking Sack 1004 was an early medieval pitched battle between opposing field armies, fought at Norfolk, England in 1004. Sweyn Forkbeard (Thetford sacked and burned; the subsequent battle with Ulfcytel's fyrd was a costly, near-Pyrrhic Danish escape) prevailed over Thetford / Ulfcytel Snillingr's East Anglian fyrd. Town sacked and burned after the Danes broke a negotiated truce; as they returned to their ships Ulfcytel Snillingr's hastily gathered East Anglian fyrd intercepted and inflicted heavy losses on them, though Ulfcytel's order to burn the Danish ships went unexecuted and the Vikings escaped. The Anglo-Saxon Chronicle records the Danes admitting they 'never met with harder hand-play in England' than Ulfcytel gave them.
The site of Thetford Viking Sack 1004 lies on White Chalk Subgroup, bedrock that formed in the Maastrichtian. The rock here is chalk.
This page covers Thetford Viking Sack 1004. A full Aubrey report for the area pulls together this battle alongside scheduled monuments and everything else the record holds within a few miles:
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