sentences:  He travelled as a naturalist of the Royal Geographical Society, but was in fact a British agent.With his dark, Semitic looks and skill at riding a camel, Leachman was easily able to pass as Bedouin and often travelled incognito.Leachman's first major expedition south into the Arabian Peninsula was in 1909, during which he was involved in a ferocious battle between the Anaiza and Shammar tribes near Ha'il.