Yes, I know that "Polish Brigade" members were not only Polish soldiers as my country lost it's independence 66 years before Civil War. So sometimes they were enlisted as Germans or Russians or coming from Prussian partition.
Another Polish emigre colonel Skymanski fought for South but he's rarely mentioned in all sources. Jonas M. Bundy, one of the "peace commissioners" dispatched by General Pope to Confederate General E. Kirby Smith after the Confederacy in the East had surrendered at Appomattox wrote a story about colonel on http://stellar-one.com/cw/0015.htm .
But I could not find anything more about colonel Sky.