Yes, but the article talks about military technologies and their impact on the extent of civilized areas. Neither Islamic nor Mongol invasions were based on new

Yes, but the article talks about military technologies and their impact on the extent of civilized areas. Neither Islamic nor Mongol invasions were based on new technologies (if anything, they had less sophisticated equipment than their opponents). Also these invasions didn't result in significant changes of the civilized area (cf. the American frontier or Russian expansion into Siberia).