By comparison with the terrifying acts of civilized armies of the era, the Mongols did not inspire fear by the ferocity or cruelty of their acts so much as by the speed and efficiency with which they conquered and their seemingly total disdain for the lives of the rich and powerful. The Mongols unleashed terror as they rode east, but their campaign was more noteworthy for its unprecedented military success against powerful armies and seemingly impregnable cities than for its bloodlust or ostentatious use of public cruelty.