They were developed to take the place of horses, where horses were not common. They were also successful against enemy horses, as horses are typically afraid of camels' scents. Camels were seen as exotic and useful creatures, known for their ability to move over desert terrain. It is noted that dromedaries were used less often than camels, though the title "Dromedarii" may imply that dromedaries were used more often. However, the Romans could not distinguish between camels and dromedaries, thus using both as a means of transportation. This is very similar to the camel cavalry used often by the Ottoman Empire. It is noted that camel cavalry was more commonplace as a result of the desert terrain during the Muslim conquests.