Proceeding to Suez, from where Niebuhr made a visit to Mount Sinai, in October 1762 the expedition sailed to Jeddah, and then journeyed overland to Mocha. Here, in May 1763, the expedition's philologist, von Haven, died, and shortly afterwards its naturalist Peter Forsskål also died. The remaining members of the expedition visited Sana, the capital of Yemen, but suffered from the climate and returned to Mocha.