Ideally, I try and produce a mix based upon a brigade formation of three infantry regiments, one artillery battery and one cavalry unit. But depending on the faction and the period this will be supplemented by irregulars and howitzers.
Typically, my late armies will have three batteries of guns, one or two howtizer batteries, three or four cavalry/dragoon regiments, one or two irregular units and the rest line infantry.
I limit my use of grenadiers to as close to 1:10 ratio as I can, and rarely recruit guard units except in my capital. I would only consider using mortars, if seiges were modelled correctly and my army had a seige train, and as they aren't, and don't, its easier to switch them off.
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