Andabatae, bestiarii, equites, hoplomachi, retiarii and sagittarii are some of what belligerent types?
Bestiarii Bestiarii Among Ancient Romans, bestiarii (singular bestiarius) were those who went into combat with beasts, or were exposed to them. It is conventional to distinguish two categories of "bestiarii": the first were those condemned to death via the beasts (see "damnatio ad bestias") and the second were those who faced them voluntarily, for pay or glory (see "venatio"). The latter are sometimes erroneously called "gladiators"; to their contemporaries, however, the term "gladiator" referred specifically to one who fought other men. The contemporary term for those who made a career out of participating in arena "hunts" was venatores. As a means
Sagittarii By the 5th century, there were numerous Roman cavalry regiments trained to use the bow as a supplement to their swords and lances, but the "sagittarii" appear to have used the bow as their primary rather than supplemental weapon. According to the "Notitia Dignitatum", most units of "sagittarii", especially "equites sagittarii", were in the Eastern empire or in Africa. Possibly some of the other cavalry regiments there carried bows as back-up weapons, but were not the dedicated mounted archers that the "sagittarii" were. The use of bows as primary weapons probably originated in the East in the later 4th and