Curiosity gets the best of Odysseus and he gets trapped with a dozen of his men in the cave. The Cyclops then starts to eat his men one by one until finally he comes up with a way to blind the Cyclops. After he is blinded, they escape by grasping the underside of the rams and sheep.
Odysseus send 22 men out to explore the island and all 22 men except for Eurylochus sneak inside of Circe's home, breaking the hospitality rule. There was a trap set up and Circe turns the other 21 men into pigs.
Circe sent Odysseus down to receive his Prophecy from Teiresias. If he wanted to leave this was what he must do. He was to perform sacrifices for Teiresias and Hades.