What happens when Aeneas gets to the island?

In Book III, the weary voyagers settle for the night on the island of the Cyclops. The next morning, they are approached by a haggard stranger, a Greek named Achaemenides who tells them that he was left behind by his companions in the cave of the Cyclops Polyphemus. Although his companions had blinded the monster, they were chased to their boats by a hundred more Cyclops, deserting Achaemenides on the shore. The Trojans take pity on the Greek and allow him to join them. They escape to the boats just in time, with the Cyclops close on their heels.