Danes Sack London 851 was an early medieval siege, the investment of a fortified position, fought at Middlesex, England in 851. Danes prevailed over Mercia (Berhtwulf). London and Canterbury were sacked/stormed by a Viking fleet of 350 ships; Berhtwulf, King of Mercia, was put to flight with his army. The Viking force subsequently moved south and was defeated by Aethelwulf of Wessex at the separate Battle of Aclea.
The site of Danes Sack London 851 lies on Thames Group, bedrock that formed in the Eocene. The rock here is clay, silt, sand and gravel.
This page covers Danes Sack London 851. 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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