So the foreign fleet, of which, with the exception of fifteen ships Sandoces was captain, came to Aphetae. Xerxes and his land army marched through Thessaly and Achaea, and it was three days since he had entered Malis. In Thessaly he held a race for his own cavalry; this was also a test of the Thessalian horsemen, whom he had heard were the best in Hellas. The Greek horses were far outpaced in this contest. Of the Thessalian rivers, the Onochonus was the only one which could not provide enough water for his army to drink. In Achaea, however, even the greatest river there, the Apidanus, gave out, remaining but a sorry trickle.