The Battle Rages Higher: The Union's Fifteenth Kentucky Infantry" The Battle Rages Higher tells, for the first time, the story of the Fifteenth Kentucky Infantry, a hard fighting Union regiment raised largely from Louisville and the Knob Creek valley where Abraham Lincoln lived as a child. Although recruited in a slave state where Lincoln received only 0. 9 percent of the 1860 presidential vote, the men of the Fifteenth Kentucky fought and died for the Union for over three years, participating in all the battles