After the defeat at Farnham, Haesten's surviving Danish force took refuge on Thorney Island in the Thames (near Chertsey). An English force blockaded them. The episode was part of Alfred's systematic strategy of penning Danish forces in defensible positions and waiting them out rather than risking pitched battle. The Thames bridges and burhs made Viking mobility increasingly difficult.
Wessex: c. 2,000–3,000. Danes: c. 1,500–2,000 survivors.
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