Now when, in its onward march, the army of the enemy came opposite Amyclae, at this point they crossed the Eurotas. And wherever the Thebans encamped they at once threw down in front of their lines the greatest possible quantity of the trees which1 they cut down, and in this way guarded themselves; the Arcadians, however, did nothing of this sort, but left their camp behind them and turned their attention to plundering the houses. After this, on the third or fourth day of the invasion, the horsemen advanced to the race-course in the sanctuary of Poseidon Gaeaochus by divisions, the Thebans in full force, the Eleans, and all the horsemen who were there of the Phocians, Thessalians, or Locrians.