One main theme is the complex nature of the conflict. It shows how the war was not just about slavery but also about states' rights, economic differences, and regional identities. Another theme could be the human cost. Foote likely delved into how soldiers and civilians alike were affected, with descriptions of the physical and emotional toll of the war.
Shelby Foote's novel probably portrays the soldiers as complex individuals. They would have had their own reasons for fighting, whether it was for a cause they believed in, loyalty to their state, or simply because they had no other choice. Some may be shown as brave and fearless in battle, while others might be depicted as being afraid but still doing their duty.
One of the main themes is the conflict between personal freedom and government control. The superheroes are divided on whether they should be regulated by the government. Another theme is loyalty, as friends and allies find themselves on opposite sides of the conflict.
One common theme is division. In a 2nd civil war novel, the nation is often split along ideological, political, or social lines. Another theme is power struggle. Different groups fight for control over the country. Also, there is the theme of sacrifice. Characters may have to sacrifice their personal beliefs, relationships, or even their lives for the cause they believe in.
One of the main themes could be power struggle. Angels might fight over who gets to lead or have more influence in their celestial realm.
Race is a major theme. Faulkner shows how the Civil War was not just about states' rights but also deeply intertwined with issues of race. Another theme is the decline of the Southern aristocracy. The war brought an end to their privileged way of life.
Since I'm not sure which exact novel you refer to, generally in civil war novels, themes like conflict, divided loyalties, and the destruction of society are common. It's likely that Angus Wilson's civil war novel also explores these aspects.
One of the main themes might be the division between people. The North and the South were deeply divided during the Civil War, and this could be explored in the novel through the characters' relationships, beliefs, and actions. Also, the theme of sacrifice is likely present. Many soldiers sacrificed their lives during that war, and the novel may show how this affected families and communities.
In 1895 civil war novels, the theme of national identity was often explored. The war was a struggle between two different visions for the United States. So, novels might show characters grappling with what it means to be an American, whether it was loyalty to the Union or to the Confederacy. Also, the theme of brotherhood (and in some cases, the breakdown of it) was present. Soldiers formed strong bonds with their comrades, but the war also pitted brother against brother in some families.
Survival is a major theme. In the midst of a civil war and a zombie outbreak, characters have to find ways to stay alive. They need to find food, shelter, and protect themselves from both the living enemies in the civil war and the undead zombies.
One of the main themes is the concept of courage. The protagonist's journey in the civil war is filled with moments where he has to face his own fears and redefine what it means to be brave.