Battle of Raging Seas

Circa year 442

The gaigin were commanded to leave Otosan Uchi and retaliate as a reply. In the battle, Hantei Yugozohime is slain and the clans band together to slaughter the gaijin. The shattered remnants of the gaijin fleet flee where many of their numbers are consumed in a mysterious storm.

Hantei Muhaki assumes the throne and bestows minor clan status upon Agasha Kasuga and his followers. This was a strange decision as Agasha Kasuga's followers helped the gaijin fleet flee to safety. Under these circumstances the Tortoise Clan is born. ((Rokugan Campaign Setting, 186)