After the two-day Battle of the Medway, the Britons retreated across the Thames and the Romans followed. Cassius Dio records that Batavian auxiliaries swam across and Celtic warriors were caught in marshes. The exact crossing point is debated (Lambeth, Westminster or Brentford), but the action secured the Thames line and triggered Claudius's personal arrival to take the surrender at Camulodunum.
Significant British casualties in the marshes
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