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Ultimately, my goal is to try to figure out more about the so-called Marian Reforms. It seems to me that most of those that were accredited to Marius don't actually seem to be from him or even from that time period.
Another issue I am having trying to understand the "Romans Citizens in the Cavalry" question is that if they no longer provided that force, what about their military service? I was led to understand during my studies that all Romans had to serve, at least if they were physically and economically capable of it. In a time when warfare was endemic to pretty much everyone, a completely normal and customary part of society and culture, why would they just stop serving and give up the glory of victory and conquest? Why would the state discount a major portion of the population that was capable of serving even if they didn't have to? I don't know the exact percentages of the top of my head, but lets say they represented 5% of 500,000 eligible citizens to serve. That is still 25,000 men.
Damn, I really want a time machine, trying to figure this stuff out is starting to give me a headache. But then again, maybe that's the lure of it.
Don't we all!
Whilst the Reforms are commonly attributed to Marius, I think it is perhaps better viewed also as 'expected evolution' - and this is also, perhaps, the reason for the changes you are puzzling over.
One of the basic ideas behind the Early Republican structure, as you note, was the idea of service; which is simply an outgrowth of the original Greek style of 'City State' armies - where the populace served. Fundamental to the idea was that the citizens were only called up for the campaign season (Summer (sic)); having sown their summer crops; and were then released to harvest those crops and perhaps sow the Winter ones - war was very civilised and structured. :wink:
By the time of Marius the Roman Republic was taking on more of the attributes of an 'empire' - particularly with regards to the need to maintain standing garrisons/armies to an ever greater extent (this had been done in smaller numbers before and special arrangements including pay and recompense for lost harvests had to be made). It was therefore natural that the citizen farmers, let alone their officers and generals (Equestrians and Patricians who were always only really serving (particularly the latter) to support their political career - which was what really mattered to them); would be happy to serve for longer periods less and less; let alone the total numbers needed.
The result - the rise of a (indeed effectively the first) professional paid army - more loyal to its pay, loot & booty, and its commanders. It's actually more the professional army and the 'effectively' need to use it that drove further expansion, as well as any other 'foreign policy' decision.
To return to the core of your topic - I am sure that, whilst we know that Plebeians (and now particularly the lowest classes who didn't have 'farms' and who happily enlisted) formed the main body of the legions; and that Patricians still lead them; it is more than likely that Equestrians still served - and most probably in roles similar to those that existed before and after - we can only hope to 'join the dots'.
Thus, serving as Tribunes, some perhaps in the Centurionate, and also Decurions/Prefects (officers, at the very least liaison ones), would still need to lead/be attached to the various 'allied' cohorts and particularly cavalry units that were used.