Roman army was truly regarded the most strongly armored in the ancient times, and the legions were special giant comprising units of the army. Initially the term indicated the whole roman army itself then it flourished into its new meaning known today. The legions were vital until at least the fifth century.
The legions consisted of the core of the society,that is peasants who paid for their armor themselves. Slaves who were imprisoned were endowed freedom in difficult war times. Other soldiers, though, were prompt to enter the army by the finance shortage also. The legionaries were paid 225 denarii a year later the emperor Severus increased the pay up to 500 denarii a year. With the flow of time a bunch of people enriched the Empire legions with their skills and capabilities and already by the fourth century 2000 men replenished the legion. In the most flourishing period of its history a typical legion was comprised of several units:
1)The equites(cavalry) was the most prestigious unit for young affluent Romans to demonstrate their skills to set up their future political career. It was the most outnumbered.
2)Velites included poor men who couldn’t afford to pay for the equipment.They were to harass the enemy.
3)Heavy Infantry presented the principal unit of the legion which was comprised of ‘hastati’-inexperienced young soldiers, ‘principes’-more experienced soldiers, often better equipped, and ‘triarii’- the veteran soldiers .
Along with all this the discipline in the legions was quite severe. Some really harsh punishment methods urged the legionaries perform appropriately. The most notable was perhaps “decimation” which implied choosing one man out of ten by military lots for dereliction of duty and making the other nine to beat him to death with bare hands and then have them live outside the legion even renewing the military path.