Since both were satisfied with this, they exchanged their places in the ranks at the first light of dawn. The Boeotians noticed that and made it known to Mardonius. When he heard this, he straight away attempted to make a change for himself also, by moving the Persians opposite the Lacedaemonians. When Pausanias perceived what was being done, he saw that his action had been discovered and led the Spartans back to the right wing; Mardonius did the same thing on the left of his army.