WWI is a romantic war, in all senses of the word. An entire generation of men and women left the comforts of Edwardian life to travel bravely, and sometimes even jauntily, to almost certain death. At the very least, any story or novel about WWI is about innocence shattered in the face of experience.

Love and marriage are wonderful arenas in which to place a character. We are most likely to risk our morals and beliefs while in love. Betrayal gives tremendous insights into a character as well.