1) Several journal articles, and some painstaking research. Remember, some of us are professiona historians, so in EB, you may get a very educated opinion in regards to some units.
I'm going to use some modern terms, but don't think of them as green berets or anything. Just think military terminology applied to the ancient world.
Here is our layout: After the Social War, the Roman Army had a significant problem on its hands. The Extraordinarii, so long an effective and reliable 'special operations' unit (armed recon, fortress assault, rearguard action, guerilla warfare, you get the idea). The solution was to create/hire a new group for the same action. The name antesignani (literally, 'before' or 'forward of' the standard) is used, because it tells us that they are not a battle-line formation at all times. They operate within their own command and control nexus, though linked with an army's. In Polybian times, the Antesignani were simply picked hastati (and velites) that performed a reconissance role. Later, during Caesar's time and slightly before (post-marian, in other words), they took on the role of the now defunct extraordinarii, albeit not quite as well.
There are several reasons to think this way. I'll list them for you:
a) They are described as operating in all these roles
b) the linguistics of the name would suggest the usage
c) assault troops in the greek world are described similarly
d) some authors refer to them as hypaspists (obviously greek authors), and we know that the hypaspists also carried out this role to a more limited extent (as assault infantry, but also as line infantry when the time called for it).
2) Trust me, creating stacks of them will be impossible if you don't cheat. Costs in EB for elite units are exhorbitant, to force players to use 'regular' troops in the battle line, and augment them with elites (like real ancient armies).
3) Vigiles are essentially militia. Think of them, not necessarily as augustus's vigiles, but rather 'city guards', though obviously associated with the aforementioned group.
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