"The Secret Battle" is a novel by the famous English writer Alan Patrick Herbert, which was published in 1919. The book tells the story of a young officer who during the First World War is in the most difficult situation - between military duty and his own principles. Watching his comrades face moral dilemmas, the hero is forced to make difficult choices that affect his moral state and relationships with those around him. Readers are exposed to the difficult truth of war, which affects the psychology of the heroes and the relationships between people in conditions of stress and danger. "The Secret Battle" is an important work that helps to understand the inner world and psychology of a person in the conditions of war, as well as to raise questions about the supremacy of morality and military duty.