After being made pregnant and seemingly 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 ("Déposons 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, knowing that Marguerite is not in there alone, sings a mocking burlesque of a lover's serenade under Marguerite's window ("Vous qui faites l'endormie"). Valentin takes the bait and comes out of the cottage, now knowing that Faust has debauched his sister. The two men fight, but Faust is reluctant to hurt the brother of the woman he adores. Méphistophélès blocks 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 the sadistic Méphistophélès and then by a choir of devils. She finishes her prayer but faints when she is cursed again by Méphistophélès.