The book "Angels on the battlefield. A history of the work of Catholic sisters during the late Civil War" by George Barton is a study of the enormous contribution of Catholic sisters in helping the wounded and sick during the American Civil War. The book tells about the incredible efforts of the sisters in providing medical aid, caring for the wounded and organizing hygienic conditions on the battlefield. The author describes in detail the difficult conditions that the sisterhood had to face during the war, and also notes the selfless work and sacrifice of these women. Angels of the Battlefield sheds light on little-known aspects of Civil War history and highlights the importance of humanitarian aid in the most difficult times.