During the Sinai and Palestine campaign 217 Australian and unknown numbers of British, New Zealand and Indian soldiers were captured by Ottoman forces. About 50% of the Australian prisoners were light horsemen including 48 missing believed captured on 1 May 1918 in the Jordan Valley. Australian Flying Corps pilots and observers were captured in the Sinai Peninsula, Palestine and the Levant. One third of all Australian prisoners were captured on Gallipoli including the crew of the submarine AE2 which made a passage through the Dardanelles in 1915. Forced marches and crowded railway journeys preceded years in camps where disease, poor diet and inadequate medical facilities prevailed. About 25% of other ranks died, many from malnutrition, while only one officer died.