The army (Latin: "legio") consisted, according to Livy, of exactly 3,000 infantry and 300 horsemen, one third from each of Rome's three founding tribes.* Boak, "A History of Rome to 565 AD", p. 69</ref> Warriors served under six "leaders of division" (Latin: "tribuni") who in turn served under a general, usually in the person of the reigning King. Mommsen uses philological arguments and references from Livy and others to suggest that the greater mass of foot-soldiers probably consisted of "pilumni" (javelin-throwers), with a smaller number possibly serving as "arquites" (archers). The cavalry was far smaller in number and probably consisted solely of the town's richest citizens. The army may also have contained the earliest form of chariots, hinted at by references to the "flexuntes" ("the wheelers").