Catherine Petkoff is a character from the play "Arms and the Man," written by George Bernard Shaw. She is the daughter of a Bulgarian general and is portrayed as a strong-willed and intelligent woman. Catherine is engaged to Sergeant Bluntschli, a Swiss mercenary, and her character challenges traditional gender roles of her time. Throughout the play, Catherine evolves from a romanticized view of war to a more realistic understanding of its consequences. Her interactions with other characters, including her husband Major Sergius Saranoff, highlight her growth and the complexities of love and conflict in a wartime setting.