 Mardonius evacuated Attica and wintered in Thessaly; the Athenians then reoccupied their destroyed city.Over the winter, there seems to have been some tension among the Allies.The Athenians in particular, who were not protected by the Isthmus but whose fleet was the key to the security of the Peloponnese, felt hard done by and demanded that an Allied army march north the following year.