How did ben gunn get to treasure island?

Ben Gunn was shipwrecked on Treasure Island after the Hispaniola crew mutinied against Captain Flint. He was part of Flint's crew but became marooned on the island when he was abandoned by the mutineers. Having been stranded for three years, he survived by scavenging and living off the land. His knowledge of the island and its treasure became invaluable to those seeking Flint's hidden gold.