Andersonville: a Story of Rebel Military Prisons, all four volumes

According to Wikipedia: "John McElroy (1846–1929) was an American printer, soldier, journalist and author, most known for writing the novel The Red Acorn and the four-volume Andersonville: A Story of Rebel Military Prisons, based upon his lengthy confinement in the Confederate Andersonville prison camp during the American Civil War... In January 1864, he was among dozens of men captured in a skirmish near Jonesville, Virginia, by Confederate cavalrymen under William E. Jones. McElroy sent to a variety of camps before being assigned to Andersonville prison, where he remained for the rest of the war. After the war ended, McElroy was released from captivity and transported back to the North. He settled in Chicago and resumed the printer's trade. He became a local reporter and newspaperman before moving to Toledo, Ohio, to become an editor of the Toledo Blade. He married Elsie Pomeroy of Ottawa, Ohio, and raised a family. In 1879, he wrote Andersonville: A Story of Rebel Military Prisons, a non-fiction work based on his experiences during his fifteen-month incarceration. It quickly became a bestseller and remained popular for the next twenty years."