I do not know of any Catholics engaging in that, vs. a certain class of early colonialists seeking to subdue Native Americans.
However, medieval Rome did require her secular authorities, whatever office they may hold, to the best of their ability exterminate in the territories subject to their jurisdiction all heretics pointed out by the Church. Or RC subjects were absolved from obeying them. - http://www.fordham.edu/halsall/basis/lateran4.asp Which type of warfare early Prots had to unlearn.
Note: The proprietor of that website is an aggressive homosexual ideologue. I've run into him before. Just a warning. Take what you see there with several grains of salt. He has an agenda, to put it mildly.