The farmers gathered together as if they were standing guard, and the women were praying to the Virgin Mary. Countess Bergenfield led the housekeeper to rest in a rough chair nearby, which made people feel strongly that the battlefield was in front of them. After a while, although the countess retired, the farmers were still shouting. At this time, the heroic and invincible French grenadier Sgt. Surby led a girl in military uniform, Mary, who was picked up from the battlefield by Sgt. Surby when she was very young. Now she has grown into a big girl, slim and graceful, working in a small shop in the barracks. She is optimistic and happy. Whether in wartime or in peacetime, she always sings songs without composing music. Became a red man in the army, and everyone called her a girl in the army. She began to sing the song of life, and then sang a duet with the sergeant. Lively Mary is a young woman, so whenever she thinks of saving her youth on the cliff, she is often depressed, and the sergeant is very worried about it.
One day, she revealed to the sergeant that she loved Togno very much. The sergeant insisted that she must marry someone in the regiment, but the young man was not in the regiment and was not allowed. At this time, the soldiers came to report that they had caught a Tyrol youth wandering around the position. The rural teenager was taken to the military camp and accused of being a detective. He will be executed. Mary found out that Togno had saved her life. Before sparing his life, she enthusiastically put in a lot of good words for him. Togno wanted to live with Mary, so he was approved to be a soldier in the regimental headquarters. This made Mary sing gratefully: "As you all know," and the whole regiment of soldiers sang a song of unity along with it. After the soldiers left, Togno expressed his ardent love for Mary and expressed his willingness to die for her. Mary also expressed her love for Togno, saying that for her sake, he must live, not die or die. The two were immersed in the joy of love. It was a duet.
At this time, Sulby came back, Togno expressed his desire to marry Maria and left in a hurry. Countess Bergenfield went into hiding during the war. It was not until the end of the war that she learned from Surby that Mary was her long-lost niece. The countess decided to take her back to the castle in Paris. At this time, the whole regiment of soldiers reappeared and sang an exciting song "War and Victory". Mary was heartbroken when she heard it. Mary sang "Farewell to all of you" and "Farewell Song" sadly to bid farewell to the whole group. Togno was sad because he knew it would be difficult to see Mary again. At Bergenfield Castle
In order to cultivate Mary into a lady, the countess forced her to learn minuet and asked someone to teach her to sing. In order to let Mary learn to master the decorative skills of singing, the countess played the accompaniment for her personally and asked her to sing Canzona by Farrow. But Mary is not interested in these. She misses the army and togno. To Mary's annoyance, the countess ordered her to marry the Duke of craken. The more Mary thinks about it, the angrier she gets. She went to see Soapy, the housekeeper (Soapy retired due to injury and has now become the housekeeper here), and sang "Song of Unity" together to relieve boredom. The countess was shocked, angrily came in to stop and then went out, and so did Sulpice.
Mary was left alone in the room, and she missed her partner in Japan again. At this time, with the sound of drums, the soldiers came here. Togno was promoted to an officer for meritorious service. Mary and the sergeant rejoiced at their reunion. They sang a duet. Maria introduced Togno to the countess, but the countess announced that Maria would marry the Duke of craken and asked Togno to leave at once. Togno told the weeping Maria, "I must make you my bride." Step back.
Mary told Surby that she wanted to run away with Togno, and Sergeant Surby agreed with them. But soon the lady confessed to them that Mary was actually her own daughter, which made Mary and them feel embarrassed. At this time, the mother of Duke Claktrop appeared and angrily accused the bride of not seeing her, while the notary asked her to sign it. Maria rushed to Mrs. Bergenfield, called "Mom" and asked, "Do I have to sign it?" Togno rushed in with army soldiers singing "Let's save our daughter". They shouted "Don't let her be a victim of marriage" and they strongly opposed Mrs. Mary's marriage arrangement. In front of the frightened guests, Maria sang about the military's love for her. In order to please her mother, she was going to sign a marriage certificate for her. But Mrs. Bergenfield pointed to Togno and said, "Marry the person you choose." Mary and Togno embraced happily. The countess only secretly regretted it and reluctantly accepted Togno as her son-in-law. The soldiers were very happy and sang "Song of Joy" in unison to pay tribute to France.
Curtain falls