The Chronicle records Edward built a second burh at Hertford north of the River Lea in 913, complementing the earlier south bank fortification. The twin burhs controlled the river crossing and prevented Danish movement from the north through Essex. The garrison of both burhs together created a formidable obstacle. This was part of a consistent pattern of twin burhs at river crossings that Edward deployed throughout his campaign of systematic northward advance.
West Saxon army under Edward the Elder
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