In March 1185, when MINAMOTO no Yoshitsune came down to the Shikoku region to search and kill Heishi (the Taira clan), Michinobu proceeded to the Yashima Peninsula with leading a warship and presented the ship to Yoshitsune in the Battle of Shido.
文治元年（1185年）2月、源義経が平氏追討のため四国へ下ってくると、通信は軍船を率いて屋島へ赴き、志度合戦で義経に軍船を献上した。