Tribesmen of Central Asia (after the domestication of the horse) and American Plains Indians (after gaining access to horses by Europeans)[22] became extremely adept at archery on horseback. Lightly armoured, but highly mobile archers were excellently suited to warfare in the Central Asian steppes, and they formed a large part of armies that repeatedly conquered large areas of Eurasia. Shorter bows are more suited to use on horseback, and the composite bow enabled mounted archers to use powerful weapons.[23] Seljuk Turks used mounted archers against the European First Crusade, especially at the Battle of Dorylaeum (1097). Their tactic was to shoot at the enemy infantry, and use their superior mobility to prevent the enemy from closing with them. Empires throughout the Eurasian landmass often strongly associated their respective "barbarian" counterparts with the usage of the bow and arrow, to the point where powerful states like the Han dynasty referred to their neighbours, the Xiong-nu, as "Those Who Draw the Bow".[24] For example, Xiong-nu mounted bowmen made them more than a match for the Han military, and their threat was at least partially responsible for Chinese expansion into the Ordos region, to create a stronger, more powerful buffer zone against them.[24] It is possible that "barbarian" peoples were responsible for introducing archery or certain types of bows to their "civilized" counterparts – the Xiong-nu and the Han being one example. Similarly, short bows seem to have been introduced to Japan by northeast Asian groups.[25]