 It was not uncommon for archery exchanges to be performed for quite some time, and in the 1183 battle of Kurikara, for example, fifteen arrows were shot by each side, then thirty, then fifty, then one hundred, before these hundred samurai on each side actually engaged one another in battle.It was also not uncommon for messages to be tied to these arrows, which could be shot into fortresses, battle camps or the like.This practice of the formal archery exchange likely died out gradually following the end of the Heian period, as war became less and less ritualized.