how did reach contry of hoynmus

In Part IV, Chapter I, Gulliver leaves his children and pregnant wife yet again to go on his fourth voyage, this time as captain. Not long into the trip, his crew mutinies, locking him into his cabin for a great deal of time and threatening to murder him. Eventually the crew, who plan to become pirates, drop Gulliver off on an unknown island. The island is home to the Houyhnhnms.