Further preparations against Greece. Dispute about the succession
to the Persian throne. Death of Darius.
There is an obvious break between the sixth and seventh books.
Indeed, it is probable that the story of the Invasion of Xerxes was
written before the rest of the history (cf. Introd. 12).
th\n e)s *sa/rdis e)sbolh/n. For the attack on Sardis cf. 8. β 3 and
especially v. 99 f.