In Article 20 of "Koshuhatto no shidai" (bunkokuho (the law individual sengoku-daimyo enforced in their own territory) for the Koshu area) enforced by Shingen TAKEDA, it is set forth as "Since the world is in the warring state, give priority to preparation of arms and armors to other matters."
武田信玄の「甲州法度次第」の第20条に「天下戦国の上は、諸事をなげうち武具の用意肝要たるべし」とある。