Battle of Shizugatake
In 1583 when Hideyoshi defeated Shibata Katsuie at the Battle of Shizugatake the Mōri had retained neutrality but they abandoned the opportunistic line and reached out to become subordinates of Hideyoshi. At this time Kobayakawa Takakage offers up his adopted son, Kobayakawa Hidekane, who is really his younger brother as hostage to Hideyoshi.