Cassio, commanding the night watch during the time of feasting and drinking, takes his orders from Othello, who directs the soldiers to drink with moderation and keep the peace. Cassio and Iago, his second in command, will see to this. Then Othello and Desdemona retire to bed, the first night they will spend together since their marriage.
Alone, Iago makes suggestive remarks about Desdemona to Cassio, which Cassio turns aside; then Iago invites him to drink. Cassio declines, but Iago wheedles and urges him, until Cassio finally relents. Iago spurs Roderigo into a fight with Cassio; others join in and Iago sends Roderigo to ring the alarm bell, waking Othello and bringing him and his armed men to the spot. Othello demands to know who started the fight, and feigning reluctance, Iago names Cassio. Othello relieves Cassio of his post on the spot. Then he and Desdemona return to bed.
Iago advises Cassio to ask Desdemona to speak on his behalf with her husband. Cassio agrees, and Iago uses his wife, Emilia, to arrange a private meeting between Cassio and Desdemona.
