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1. put some dismounted horses behind them to show they've dismounted or don't even bother
2. with the right paint job, I'm sure you can use figures like the Tsar to represent just another general. Maybe some minor conversions to add variety.
3. If you're feeling the need to really cut and paste, cut the Strelets French mounted set generals at the waist and replace with suitable looking Russians
and don't forget the Italeri Russian - Austrian general staff. 2 mounted generals and 1 general on foot. and the pavlov officer could easily converted with a simple headswap.