What martial art system did the Roman Legion troops used?

As we all know it,every civilization had one martial art system.From what I heard,historians discovered records in ancient Roman forts and barracks showing instructions of performing a full hybrid combat system that explained fighting with weaponry,fighting unarmed,and grappling and wrestling techiques.According to historians,the manual seems to have taken a lot from the Greek martial art Pankration,the fighting system of the Gauls,and martial arts from groups the Romans have conquered.Anyone aware of this?Could anyone who knows about this tell me the name of the martial art of the Roman Legion and leave weblinks to websites that tell more about this martial art?I would appreaciate it.