In MTW1 and RTW, I garrisoned cities with peasants. My only concerns were "domestic tranquility" and costs. Field armies drove on would-be besiegers.
Milltia has made a made big differenes. Maintenance cost is far less of a concern. There's a variety of units, including some cavalry. I've had some very nice little pitched battles with besiegers that are far more infantry heavy than I'm used to. They also make a very good source of reserves for bigger operations, being able and available to join the regular army. Once I get control of the sea, they can remain in free upkeep until I need them, then travel by ship to mass very quickly.
Nice change, all round.
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