Much is known about what Confederate soldiers fought for; far less is understood about why they fought on despite long odds and terrible costs. Drawing on soldiers’ letters and diary entries from 1863 to 1865, Diehard Rebels explains how religious dogma and perceptions of Union barbarity and ineptitude affirmed in many soldiers a view of an indomitable South. Within the soldiers’ closely circumscribed world, other elements reinforced convictions that the South was holding its own against great but surmountable odds. Close comradeship and disorienting combat conditions were factors, says Phillips, as well as conclusions drawn from images and experiences contradicting the larger reality, such as battlefields littered with enemy corpses and parade-ground spectacles of Confederate military splendor.

Troops also tended to perceive the course of the war in far-off theaters, the North, and overseas in positive ways. In addition, diehards were both consumers and conduits of rumors, misinformation, and propaganda that allowed them to envision a war that was rosier than the truth but still believable. Instead of crippling diehards after defeat, old notions of southern superiority helped them uphold southern honor. The central elements of Confederate invincibility fueled white southern defiance after surrender and evolved into the Lost Cause.