Cleomenes had taken up a strong position, placing his army across a road that followed a river running between two hills, Olympus and Eva.
His army of 20,000 infantrymen was composed of Spartan hoplites, possibly Spartan pikemen (according to Plutarch, Cleomenes had armed 2.000 Lacedaemonians in the Macedonian way), perioeci, mercenaries and about 650 cavalry. The Spartan phalanx, under the personal command of Cleomenes, made up the right wing of the battle line and was positioned on the hilltop of Olympus near Sellasia. This force was supported by a body of light infantry mercenaries. The allied troops as well as the perioeci phalanx were led by Cleomenes' brother, Eucleidas. These forces made up the left wing of Cleomenes' battle line and were positioned on Evas. The center occupied the valley and road and was made up of Spartan cavalry, supported by mercenaries. Cleomenes probably hoped that the higher tactical position his army enjoyed would compensate for his numerical inferiority. To be sure, he ordered a ditch dug and a palisade raised all along the front line.
Antigonus, for his part, arrived on the scene with a superior force of around 30,000 men, including the allied forces of the Achaean League. For the first time since the beginning of the 3rd century BC, the Macedonians arrayed against the Spartans a true national army and not one composed of mercenaries.
Antigonous alone had with him 10,000 pikemen, 3.000 peltasts and 300 horse from Macedonia as well as 1.000 Agrianes, 1.600 Illyrians, 1.000 Gaul and 3.000 unidentified mercenary foot and 300 horse. The allies provided him with further important contingents, the Achaeans with 3.000 foot and 300 horse, the Boeotians with 2.000 foot and 200 horse, the Acarnanians with 1.000 foot and 50 horse, the Hepirotes with 1.000 foot and 50 horse. According to Plutarch, out of 6.000 Spartans, only 2 survived, the others preferring honorable death to disgrace. Cleomenes fled to Alexandria where he stayed until his death.
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