Group of Union officers who escaped from Confederate prison at Columbia, S.C., in the fall of '64 also three guides procured in the mountains of Tennessee.(Library of Congress )

In Captured Freedom (2023, Steve Procko), author Steve Procko tells the true story of nine Union prisoners-of-war who escaped from a Confederate prison in Columbia, South Carolina, in November 1864, and traveled north in brutal winter conditions more than 300 miles with search parties and bloodhounds hot on their trail. On the difficult journey they relied on the help of enslaved men and women, as well as Southerners who sympathized with the North, before finally reaching Union lines in Knoxville, Tennessee, on New Years Day 1865.

On that day, hoping to commemorate what they had accomplished, the nine officers and their three mountain guides found a local photographer and posed together for a photograph. The instant, frozen in time, showed twelve ragged men with determination strong on their faces – a compelling image that moved Steve Procko to search for their stories.