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Our interesting threads on unit strengths & figure ratios could now move to your armies' ratios of infantry & cavalry*.
This, of course, can be elastic but history gives us some guide.
I tend in Napoleonics to have 4 infantry battalions for every cavalry regiment. This tends to fit the roughly 20% of mounted troops you get when looking at the Campaigns of 12-15.
For the SYW, I try to get a 54-5 squadron cavalry unit for each 2 infantry battalions. Duffy,in 'The Army of Frederick the Great'writes that the frontages of a five squadron regiment and a two battalion infantry regiment were, at full establishment close to being the same.
You may like to contribute your Horse & Musket ratios here, and add in other periods.
donald
* for you WW2 fans, feel free to discuss mechanical horses such as tanks.