This innovative study offers the first-ever comparison of the military roles played by commissars, political officers, and chaplains in military settings ranging from the armies of Cromwell, the Jacobins, the Nazis, the Soviets, and the United States. Despite the stark differences in the political systems of the countries of these disparate armed forces, Dale R. Herspring argues that there are certain critical functions that must be fulfilled in every military, regardless of its ideological orientation. Most vital are motivation, morale boosting, and political socialization. In addition, Herspring's comparative historical analysis decisively demonstrates that the roles of commissars, political officers, and chaplains alike have evolved in ways that are crucial yet rarely understood either by policymakers or scholars.

For both the Union and Confederate soldiers, religion was the greatest sustainer of morale in the Civil War, and faith was a refuge in times of need. Guarding and guiding the spiritual well-being of the fighters, the army chaplain was a voice of hope and reason in an otherwise chaotic military existence. The clerics' duties did not end after Sunday prayers; rather, many ministers could be found performing daily regimental duties, and some even found their way onto fields of battle.

Civil War Chaplains wondered whose side God was on, and if their ministries might be in vain. They saw, on both sides, God's Spirit at work. Was the Spirit divided, was God punishing both North and South for their sins, or was there some other explanation for this seemingly endless war?