As a result, Xerxes retreated to Asia with much of his army, leaving Mardonius to complete the conquest of Greece. However, the following year, the rest of the Persian army was decisively beaten at the Battle of Plataea and the Persian navy at the Battle of Mycale. Afterwards the Persians made no more attempts to conquer the Greek mainland. These battles of Salamis and Plataea mark a turning point in the Greco-Persian wars; from then on, the Greek cities would take the offensive.