"Active Service Time" is a skillfully written war novel by the famous American writer Stephen Crane. In this book, the author tells the story of a young American, Frank Cooper, who decides to join the war and enlists in the army during the Spanish-American War of 1898. Poignantly describing the life of soldiers on the front lines, Crane successfully recreates the atmosphere of military conflict and the feelings that accompany young people who become part of military events. "Active Service Time" is an exciting book that leaves a strong impression and helps the reader better understand the essence of war and its impact on people.