Sandstorms - sandstorm - has long been shrouded in dark halo. No wonder they have a name - "sandstorm" means poison, poisoned. And these storms really ruined the whole caravans.
Simoom observed in the deserts of North Africa and the Arabian Peninsula and has the most western and south-western direction. Basically there in spring and summer.
"For an hour or half an hour before the rise merciless storm, bright sun fades, clouded by the murky haze. On the horizon appears a little dark cloud. It is growing rapidly, covering the blue sky. Here are the first violent gust blew hot, stinging wind. And a minute later pales day. Clouds of burning sand mercilessly flogged all living things, closed the midday sun. In the howling and whistling of the wind disappear all other sounds. It seems that the air itself turns against you ... "- This is the description of a sandstorm, this ancient Greek historian Herodotus
Nowadays, when the desert is crossed by roads, and above them in all directions lie airways death on the great caravan routes no longer threatens travelers.
So, in 1805, sandstorm, according to many authors, sanded two thousand and eighteen hundred camels. It is quite possible, the same storm killed 525 BC the army of the Persian king Cambyses, which Herodotus wrote