Forgotten Sons of the South

This article--written by an African-American professor, as the page states at the bottom--details the ranks of black soldiers--slave and free--who took up arms and fought valiantly against the North.

Forwarded to me also was this article, also on black Confederates, with many documented instances of blacks fighting, not out of obligation or conscription, but out of love for their homeland--and many doing so as already-freed men.

UPDATE: While doing a search on the Five Civilized Tribes of Oklahoma (my native American ancestry comes from one of these, though we're not sure which), this incredibly thorough article jumped out at me from the search results. Deo Vindice.