Mantinea turned out the Achaians and invited Cleomenes back, and now it was plain that the real question was whether the Spartan kingdom or the Achaian League should lead the Peloponnesus—in truth, between Aratus and Cleomenes.  Another victory was gained over the Achaians, a treaty was made, and they were going to name Cleomenes head of the League, when he fell ill.  He had over-tried his strength by long marches, and chilled himself by drinking cold water; he broke a blood-vessel, and had to be carried home in a litter, causing meantime the Achaian prisoners to be set free, to show that he meant to keep the treaty.