The chaos of the Abbasid revolution gave foreign powers a rare opportunity to strike at the caliphate while it was paralyzed by internal strife. Things could have gone very badly for the Arabs but the unparalleled al Mansur proved as capable against these foes as he had those who had opposed him within the caliphate. His armies faced down assaults from all directions and successfully guarded his domain, though some fringes were secured better than others.