The roman army is a very strong army that was really organized.
The first legion of the roman army was made in the 4th century BC it was made to fight against the Etruscans.
The Order in the battles:
|5th Cohort||4th Cohort||3rd Cohort||2nd Cohort||1st Cohort|
|10th Cohort||9th Cohort||8th Cohort||7th Cohort||6th Cohort|
The first cohort of every legion were the elite troops.
In the roman army, everything was really organized. Here are the rank of the roman army:
1.Contubernium: 8 men
2.Centuria: 10 contubernium (80 men)
3.Cohorts: 6 centuria (480 men)
4.Legio: 10 cohorts (4,800 men)