In doing research for other books, journalist Phil Keith, with his co-author Tom Clavin, kept coming across footnote references to a relatively obscure but legendary war hero, an American born in 1895 whose father had been the son of a former slave. Their interest was piqued, and what followed was further research. And a new collaboration, “All Blood Runs Red.” When still a child, Eugene Bullard ran away from his harsh rural roots, and though he never went beyond the second grade, he did go on