The Pythia also bade him do so. Then Miltiades son of Cypselus, previously an Olympic victor in the four-horse chariot, recruited any Athenian who wanted to take part in the expedition, sailed off with the Dolonci, and took possession of their land. Those who brought him appointed him tyrant. His first act was to wall off the isthmus of the Chersonese from the city of Cardia across to Pactye, so that the Apsinthians would not be able to harm them by invading their land. The isthmus is thirty-six stadia across, and to the south of the isthmus the Chersonese is four hundred and twenty stadia in length.