At the Volscian camp, Menenius is halted by the sentries, who refuse to allow him to see their generals. Eventually Coriolanus and Tullus Aufidius emerge, but Menenius' pleas fall on deaf ears, and he is sent away, after enduring the mockery of the guards. When he is gone, Aufidius remarks that he is impressed with Coriolanus's fortitude in ignoring the pleas of his oldest friends; the exiled soldier replies that henceforth he will accept no more embassies from Rome.
At that moment, however, a shout is raised, and Virgilia, Volumnia, Valeria, and Young Martius, Coriolanus's son, arrive from Rome. Coriolanus vows to steel his heart against them but allows them to approach, and his mother kneels before him and begs him to make peace. She tells him that she will block his path to Rome: "thou shalt no sooner / March to assault thy country than to tread... on they mother's womb that brought thee to this world (V.iii.122-25)." Meanwhile, his son pledges that when he has grown older, he will fight against his father. Coriolanus, moved, starts to leave, but his mother stops him and asks him again to make an honorable peace, one that rewards Romans and Volscians alike, rather than destroy his native city. When he does not reply, she makes ready to return to Rome and "die among our neighbors (V.iii.73)." But Coriolanus has been won over; he pledges to make peace immediately. Seeing this, Aufidius tells the audience that he now has an opportunity to eliminate the Roman general.
In Rome, a resigned Menenius, unaware of what has just happened, tells Sicinius that all is lost and that the tribunes have doomed their city with their folly. Just then a messenger arrives, with news that the women have succeeded in their mission and that Rome is saved. The Romans burst into celebration and welcome Volumnia home as the savior of her city.
In the Volscian city of Antium, meanwhile, Aufidius and a band of conspirators prepare to dispose of the returning Coriolanus, who is being given a hero's welcome by the people of the city. When the general arrives and is greeted by Antium's Senators, Aufidius denounces him, accusing him of betraying the Volscian army by giving in to the Roman women and failing to take Rome. Coriolanus, predictably, loses his temper and curses Aufidius, whose conspirators are now stirring up the people against the Roman, reminding them of how he once led Roman armies against them. As Aufidius shouts at him and the Senators try to intervene, the conspirators stab Coriolanus, and he falls dead. Declaring that he was a great and noble man, the Senate orders a hero's burial. Now remorseful, Aufidius joins his men in carrying the body through the city.
Menenius' humiliating failure to win over Coriolanus creates a pitiable spectacle. "You shall know that I am in estimation," he tells the insolent guards, "you shall perceive that a Jack guardant cannot office me from my son Coriolanus (V.ii.59-61)." But Coriolanus is not, in fact, his son; he is Volumnia's son, and only Volumnia can persuade him to show mercy. Sent away, Menenius must endure the taunts of the guards: "Now, sir, is your name Menenius? ...'Tis a spell, you see, of much power. You know the way home again (V.ii.91- 93)."
Coriolanus has stood firm against his friends, and Aufidius admits to being impressed by his steadfastness. But Aufidius does not realize, as the audience does, that the great Roman warrior will be no match for his mother; indeed, the presence of the other women, and even of his son, is purely incidental. It is Volumnia who does all the talking, playing on Coriolanus's love for her and for his family, describing the terrible position in which he has placed them. She asks, "how can we, / Alas, how can we for our country pray, / Whereto we are bound, together with thy victory, / Whereto we are bound? Alack, or we must lose / The country, our dear nurse, or else thy person, / Our comfort in the country (V.iii.109-113)." Then, she cleverly offers him a way out--an honorable peace, in which "the Volsces / May say 'This mercy we showed,' the Romans, 'This we received,' and each in either side / Give the all-hail to thee and cry, 'Be blest / For making up this peace!'(V.iii.136-140)."