http://www.youtube.com/watch?v=5o0P14p8Eew
Aldaha of Eniza tribe, the largest and one of the most prestigious of Arabian tribes.
The story behind the daha is that at some time a larger raid was about to attack Eniza. The men of Eniza being outnumbered (they were less in the past!) they came up with the idea of doing this dance. Their sounds were like that of a larger army so the attacking raid turned tail and escaped!
The men dancing infront of the row are taking the role that women used to do before. The women of the tribe would do that to remind the men that incase they lose, they will be taken by the invaders.