The Roman Legionaries were set up into groups called legions, the legions were sized from 3,000-5,000. These legions were set into smaller groups called manipals sized from 30-120 Legionaries. Roman generals each had there own armies (which was not necessarily good, for it led to many civil wars) which were set up into legions which were set up into manipals. The Legionaries were like Roman infantrymen. The legions were useful also because they were more flexible and easy to control then the Greek phalanx. Look out for my tutoriall on a Cartoon Greek Helmet!