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Sarissa.
Alexander conquered the Persian Empire using the sarissa (lance) and attempted to bring it towards Greek-like (Hellenistic) culture.
The sarissa which was a 13-21 feet long spear .
The phalanx was a tightly knit formation with heavily armored infantry whose main weapon was the sarissa which was a long spear 13-21 feet in length .
The Spartan Hoplite went into battle in a panoply of heavy armour (hopla - Hence the name 'Hoplite') within a tightly knit infantry formation known as a phalanx relying heavily upon their main weapon the sarissa which was a 4 to 7 meter long spear .