Silly as this sounds,i would wish to watch a huge Napoleonic era battle,like Waterloo,Eylau or Borodino.We have old jerky footage from WW1,in black and white.WW2 there is some colour footage.But obviously no film of the Napoleonic era.
There would have been over maybe 30000 men on both sides in quite a small area,in garishly coloured uniforms,all marching over the fields and cannon and huge cavalry forces charging here and there,it would have been an awe inspiring sight.If you could have stood on a hilltop in the distance and just observed.