Once we get to the Duke, Othello speaks in his defense: he says Desdemona was an equal participant in their courting, and there was no trickery involved. They're now very much in love and married. Our woman in question, i.e. Desdemona, finally arrives and confirms the whole story. At this, the Duke tells Brabantio to stop whining and sends Othello to fight the battle in Cyprus. Desdemona states that she'll come along, as do Iago, his wife Emilia, Cassio, and Roderigo.