After being impregnated and abandoned by Faust, Marguerite has given birth and is a social outcast. She sings an aria at her spinning wheel ("Il ne revient pas"). Siébel stands by her. The scene shifts to the square outside Marguerite's house. Valentin's company returns from the war to a military march ("Deposons les armes" and "Gloire immortelle de nos aïeux", the well-known "soldiers' chorus"). Siébel asks Valentin to forgive Marguerite. Valentin rushes to her cottage. While he is inside Faust and Méphistophélès appear, and Méphistophélès, thinking that only Marguerite is there, sings a mocking burlesque of a lover's serenade under Marguerite's window ("Vous qui faites l'endormie"). Valentin comes out of the cottage, now knowing that Faust has debauched his sister. The three men fight, Méphistophélès blocking Valentin's sword, allowing Faust to make the fatal thrust. With his dying breath Valentin blames Marguerite for his death and condemns her to Hell before the assembled townspeople ("Ecoute-moi bien Marguerite"). Marguerite goes to the church and tries to pray there but is stopped, first by Méphistophélès and then by a choir of devils. She finishes her prayer but faints when she is cursed again by Méphistophélès.