But Antigonus had collected a vast force to subdue the Peloponnesus, and Cleomenes prepared for his last battle at Sellasia, a place between two hills.  On one named Evas he placed his brother Euclidas, on the other named Olympus he posted himself, with his cavalry in the middle.  He had but 20,000 men, and Antigonus three times as many, with all the Achaians among them.  Euclidas did not, as his brother had intended, charge down the hill, but was driven backwards over the precipices that lay behind him.  The cavalry were beaten by Philopœmen, who fought all day, though a javelin had pierced both his legs; and Cleomenes found it quite impossible to break the Macedonian phalanx, and out of his 6000 Spartans found himself at the end of the day with only 200.