when enemy units switch sides?!

[TheRuler]

how is it when you bribe a enemy unique unit to switch sides with your spies?
i haven't done this, yet but as i took over a bantu light cavalry (ancient age) with the british he suddenly turned white

i mean does the unit keep his special abilities or turn into a normal unit?
anyone tried this yet?

[TheRuler]

SPORRY, i was clicking a bit to often!