The bravest of these, Rinaldo, has fallen under Armida's spell. She comes to love him so deeply that she cannot bring herself to destroy him. Act 1 Scene 1: A council chamber in the royal palace of Damascus. King Idreno is alarmed that the crusaders have crossed the Jordan River. The heathen sorceress Armida seems to have triumphed over the crusaders, but fears that her conquest is not complete without gaining the love of the Christian knight Rinaldo. Now Rinaldo is obsessed with Armida and promises to fight against his fellow Christians, if victorious King Idreno offers him the kingdom and Armida's hand. Armida prays for Rinaldo's safety. Scene 2: A steep mountain, with Armida's fortress at the top. The knights Ubaldo and Clotarco plan to free Rinaldo from Armida's clutches. Idreno sends Zelmira, the daughter of the sultan of Egypt, to ensnare the Christians but on encountering Clotarco she falls in love with him and offers to lead him to safety. Scene 3: Armida's apartments. Rinaldo admires the bravery of the approaching knights. Ubaldo warns Rinaldo to beware Armida's charms, and reproaches the dereliction of his duty as a Christian. Although remorseful, Rinaldo is unable to escape Armida's enchantment. Act 2 Scene 1: A garden in Armida's palace. Zelmira fails to dissuade Idreno from planning an ambush of the crusaders. Idreno pretends to agree to Clotarco's demand that the Christian knights enchanted by Armida be freed. Reluctantly, Rinaldo leaves with Ubaldo. Armida expresses her fury. Scene 2: The crusader camp. Ubaldo welcomes Rinaldo, who prepares to go into battle. Armida begs for refuge and Rinaldo's love. Rinaldo departs for battle with Ubaldo and the other soldiers. Act 3 Scene 1: A dark, forbidding grove, with a large myrtle tree. Rinaldo, knowing that the tree holds the secret of Armida's powers, enters the wood intending to cut it down. Zelmira appears with a group of nymphs, and they try to get him to return to Armida. As he is about to strike the myrtle, Armida, dishevelled, appears from it and confronts him. Armida cannot bring herself to kill him; Rinaldo strikes the tree and the magic wood vanishes. Scene 2: The crusader camp. The crusaders prepare for battle against the Saracens. Armida appears, swearing to pursue Rinaldo everywhere. As Rinaldo moves off, she sends an infernal chariot after Rinaldo. Music Karl Geiringer has commented on how Haydn adopted the "principles