Raina Petkoff is a romantic young girl who has an idealistic views of war. She is engaged to Sergius, a young officer with romantic views about war too. A escaping enemy soldier, Bluntschli, breaks into Raina's bedroom. This soldier is practical and teaches Raina the realities حقائق of war. Bluntschli is a soldier (a Swiss soldier for hire, fighting for the Serbs) who prefers a supply of chocolates to bullets when he goes to the front .
Raina's romantic idea about soldiers will change when Bluntschli tells her that he is afraid to die. However she lets him escape because she loved him.
After the war is over, Major Petkoff and Sergius returned and spoke about Bluntschli who has helped them in moving their armies. Bluntschli is ready to fight for any side that pays. The men have also heard stories about the Swiss soldier's escape and how a young girl had given him shelter . They do not know that that happened in Raina's room.
Sergius is attracted to Louka (the servant). While Major Petkoff and Sergius are in the library, Captain Bluntschli arrives to return the coat which Raina lent him. Raina and her mother wanted the Captain to leave and pretend not to know him when Major Petkoff and Sergius greet him warmly. The men invited Bluntschli to lunch. After lunch, Major Petkoff asks for his coat and Raina becomes afraid that he may discover the photo that she had put in the pocket for her "Chocolate Cream Soldier."
Sergius learns the true character of the "Chocolate Cream Soldier" and asks Bluntschli for a duel . Raina refuses and expresses her real feelings for Bluntschli. Louka succeeds in getting Sergius for herself and Major Petkoff and his wife accepts Bluntschli's marriage to Raina.