<P> The earliest known depiction of a phalanx - like formation occurs in a Sumerian stele from the 25th century BC . Here the troops seem to have been equipped with spears, helmets, and large shields covering the whole body . Ancient Egyptian infantry were known to have employed similar formations . The first usage of the term phalanx comes from Homer's "(φαλαγξ)", used to describe hoplites fighting in an organized battle line . Homer used the term to differentiate the formation - based combat from the individual duels so often found in his poems . </P> <P> Historians have not arrived at a consensus about the relationship between the Greek formation and these predecessors of the hoplites . The principles of shield wall and spear hedge were almost universally known among the armies of major civilizations throughout history, and so the similarities may be related to convergent evolution instead of diffusion . </P> <P> Traditionally, historians date the origin of the hoplite phalanx of ancient Greece to the 8th century BC in Sparta, but this is under revision . It is perhaps more likely that the formation was devised in the 7th century BC after the introduction of the aspis by the city of Argos, which would have made the formation possible . This is further evidenced by the Chigi vase, dated to 650 BC, identifying hoplites armed with aspis, spear and panoply . </P> <P> Another possible theory as to the birth of Greek phalanx warfare stems from the idea that some of the basic aspects of the phalanx were present in earlier times yet were not fully developed due to the lack of appropriate technology . Two of the basic strategies seen in earlier warfare include the principle of cohesion and the use of large groups of soldiers . This would suggest that the Greek phalanx was rather the culmination and perfection of a slowly developed idea that originated many years earlier . As weaponry and armour advanced through the years in different city - states, the phalanx became complex and effective . </P>

The success of hoplites in a phalanx depended on