Dunbar, a sailing ship, was wrecked against the rocks on the outer South Head of Sydney Harbour in Australia, on Aug. 20, 1857. As the Dunbar sailed northward in a storm, its captain, James Green, thought the ship was farther south of Sydney than it actually was. He sighted breakers, but had no room to change course, and the ship was dashed broadside against the rocks. Only 1 of the 122 people aboard, James Johnson, survived. At an inquest, the captain and officers were cleared of blame.