Men-at-Arms are trained troops that come in several different regiment types which excel in their given role, all with their own stats and uses. Each type of Men-at-Arms will counter at least one other type, reducing their {{iconify|Damage}} proportional to the size difference of the countering Men-at-Arms. Men-at-Arms regiments are reinforced at a rate of 10% of their maximum size per month.
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Each Ruler has a limited number of regiments for Men-at-Arms, but existing regiments may be upgraded to increase their size. The number of regiments you can have depends on your rank, and various cultural [[innovation|innovations]] increase the number of regiments you can have and the maximum size you can upgrade them to. Regiments can also be downsized (to decrease the monthly maintenance) or destroyed; the cost to create and increase the regiments is not refunded when downsizing or destroying a regiment. Men-at-Arms regiments are inherited by the primary heir when a ruler dies; if the heir was already a landed ruler with their own Men-at-Arms regiments, the inherited regiments are added to their own, up to the maximum allowed number of regiments.