Soshitsu gained protection from Hideyoshi TOYOTOMI who gained power after Nobunaga's death, and established transportation lines extending from the Kinai region (the five capital provinces surrounding the ancient capitals of Nara and Kyoto) to Hakata and further to Tsushima.
信長の死後に台頭した豊臣秀吉の保護を得て、畿内から博多、さらには対馬にいたる交通路を築き上げた。