Detailed below are the units that served in Scotland from all over the Roman Empire
- A legion is 5000 men made up of
- 10 cohorts of 480 men
- In centuries of 80 men
- In squads of 8 men (to a tent or quarters)
- Plus 300 cavalry
- Auxilary units were attached to legions and took the name of the place they came from.
- A baggage train usually accompanied legions, a smaller number after army reforms in 130BC when general Marius decreed soldiers should carry their own equipment.
- XX Valeria Victrix Legion – invaded with Agricola in 80 AD, built the legionary fortress at Inchutill and stayed in Britain for 200 years
- VIIII Hispania Legion – the 9th legion who served with Agricola and were then transferred to Nijmegan. The fictional book about the lost legion and eagle of the 9th appears to be just that.
- II Augusta Legion –
- II Adiutrix Legion –
- 1st Spanish Cohort of Spaniards served in Perth