Thessalian horses, Lacedaemonian women and the men who drink from the sacred Arethusa were, according to one oracle cited by Strabo, the three best things in all of Greece. Regardless of whether the last two parts ring true or not, Thessalian heavy cavalry were without doubt a highly disciplined, mobile and esteemed allied unit in Greek armies. Similar in many respects to the hetairoi, the Macedonian companion cavalry, both units used the xyston double-ended lance, but some evidence suggests that at times shorter spears and javelins may also have been used. Their mobility came from the rhombus formation they adopted, reputedly invented by Jason of Pherae, that enabled a unit to turn with cohesion, form up and charge on any of its four points. During Alexander’s campaigns, the contingent of Thessalian Cavalry accompanying him numbered roughly 2,000 men, 200 for every vote Thessaly had in the League of Corinth. They were commonly assigned the left flank, guarding it from enemy cavalry as the right flank spearheaded the attack.