And confirms the historical 'plan' of the Ottoman Turks that conquering the Arab Empire was simply fighting 'one tribe' at a time since all the tribes had some 'grievance' against another tribe. Those 'downstream' a river could accuse thos 'upstream' of pissing in the water, etc. etc. The Ottoman Turks even took advantage of the Christian 'Roman Catholic' and Christian Orthodox 'split' and guessed the 'Roman Chrsitians' would not create a crusade to save their Orthodox Christians which then led to the fall of Constantinople in about 1453. Especially galling since it was the Emporer Constantine that declared Christianity the 'official religion' of the Roman Empire. So, 'Divide and conquer' works as Muslims continue to shoot each other in the foot. We need more of it in the ME.