The Allied victory at Salamis ended the immediate threat to Greece, and Xerxes now returned to Asia with part of the army, leaving his general Mardonius to attempt to complete the conquest. Mardonius wintered in Boeotia and Thessaly, and the Athenians were thus able to return to their city, which had been burnt and razed by the Persians, for the winter. For the Athenians, and Themistocles personally, the winter would be a testing one. The Peloponnesians refused to countenance marching north of the Isthmus to fight the Persian army; the Athenians tried to shame them into doing so, with no success.