Foucault & Colonial Contexts

Has Foucault ever been concerned with applying his discourse/power
concepts to colonial contexts? Except for some allusions in Discipline
and Punish & History of Madness, I haven't found much on the 
topic.

Have perhaps other researchers used a discourse/power approach?
in analyzing colonial contexts? I would especially be interested in an
application to the conquest of America.
Any hints would be much appreciated.