Army Under AugustusExercitus duce Augusto

The following information gives the organisation of the Roman Army during the reign of Augustus.

At that time there were 28 legions consisting of approximately 5000 infantrymen and was organised as follows :
Legion ( Legio )5000
Cohorts ( 10 Cohortes )500
Centuries ( 6 Centuriae )80 - 100
Officers :LegatusLegionary Commander
6 Tribuni MilitumTribunes
60 CenturionesCenturions (recruited from the ranks) in charge of centuries
RecruitmentTaken from the citizens
Length of service20 - 25 years
Pay250 - 300 denarii per day
Responsible forRepelling invasions and used in important battles for attack
Retirement benefitsLand or cash bounty
Other forces were recruited in order to help the legions and were made up of archers, slingers, cavalry and infantry and these were the auxiliaries (auxilia) :
Cavalry unit ( Ala )500
Turmae ( 16 Tumae )32
Infantry unit ( Cohors )500
Officers :Decurion ( cavalry )Decurio
Length of service25 years
Pay100 denarii per day
Responsible forHelping legions occupation and frontier skirmishing
Retirement benefitsRoman citizenship for himself and his family
A special bodyguard unit was set up to act as the Emperor’s personal guard. This was known as the Pretorian Guard, 3 cohorts of which were based in Rome and 6 in towns nearby. These were made up as follows :
Praetorian Guard ( Praetorium )4500
Officers :Praetorian Prefects2 Praefecti Praetorio
RecruitmentCitizens (Italy)
Length of service16 years
Pay1000 denarii per day
Responsible forPreservation of the position and safety of the Emperor
Retirement benefits5000 denarii