@Kolyana - For the questions concerning the Partisan unit I checked out the data on this site about civII.
The Partisan became available when you discovered the "Guerilla Warfare" tech, so no ancient partisans (rational for this could be that in ancient times dissenters were simply executed or lacked sufficient organization to mount a meaningful resistance). I suppose for civ4 I would make them available after "Communism" at least.They had half as much offense as marines and slightly less defense (I don't know exactly how this would translate to Civ4, I guess they would be close to standard Infantry, i.e not mechanized). and they would be under the control of the city's original owner.
Their special features were they ignored enemy zones of control (not applicable to civ4, however I suppose there could be a way to mod this so they can enter enemy territory like spies but not be concealed or they simply will be automatically removed after resistance in the captured city had ended). Their other feature was they treated all terrain like roads, basically a 1/3 movement bonus.
Hope this helps and I'll be interested to see if anyone can create a mod that reproduces this old cool feature.