Three aspects of Cassius Dio's account of the Claudian invasion of Britain are discussed. First, the convention, by which ancient historians routinely introduced their detailed narrative of military campaigns with a summary, allows the two first battles in the sequence to be eliminated as separate events. Secondly, the kings, Togodumnus in Cassius Dio and Cogidumnus in Tacitus' Agricola, are taken to be the same individual, who after defeat was reconciled to be Claudius' client-ruler. Thirdly, the argument is restated that the invasion took place through the harbours of West Sussex on a route suggested by the description given by Dio and by the evidence of place-names, known from the Geography of Ptolemy and the Antonine Itinerary.