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Now that Wayne mentions it, also I used the Crimean War Cossacks on foot for 1812! The sailors from the same set could double as Germans constructing WW1 trenches.
My project on the Pacific War 1879 - 1883 has drawn on Strelets ACW and Boers ranges.
A paint job on the excellent Strelets 'Gettesburg' union sets can easily represent Chilean, Peruvian and some of the Bolivian troops.
Used the Boers for one of the volunteer Bolivian units, mounted and on foot, also a few of the 1877 Russian infantry have joined the Peruvian army.
Also have Hat ACW and a few Colonial British eg machine guns, signalers, officers in Pith helmets, Italeri French Foriegn Legion (with the neck covers and tropical dress) and ACW artillery
Its one of the more colourful late 19th century conflicts (from a wargaming point of view) and number of accessible sources eg the Osprey Armies of Pacific War 1879 - 1883. Units in blue and red, white, green, grey, yellow and red. For example Bolivia had its regular units in the colours of its flag - red, yellow and green, militia in greys with coloured facing - all look great on the table).
A lot of the French Crimean figures can be used for the French Army in the opening months of WW1. I've mixed them with EWM metal figures with some success.