Under Two Flags brings to light the fascinating stories of the unique and courageous Catholic priest-chaplains who served Confederate troops (primarily) during the Civil War. The story of religion and faith in America's deadliest conflict, as well as the chaplains, has long remained untold and forgotten. Robert Miller now provides a comprehensive and compelling portrait of some of the 52 Catholic priests (25 of them "full-time") who served Confederate troops, in hospitals and prisons between 1861-1865. Their story has never before been told - and as in his previous books in this field (Both Prayed to the Same God in 2007, and Faith of the Fathers in 2025), Miller brings to life stories of unknown CSA priest-chaplains like Isidore Turgis, Thomas O'Reilly, John Bannon, Darius Hubert and Egidius Smulders. A complete listing of all 52 Catholic chaplains who served the Confederacy is included as an Appendix, as is a select Bibliography. A truly fascinating story by an author who knows this field!