While Muneshige went to Osaka and Kyoto to get a chance to meet the shogun, Tokugawa Ieyasu, who seized power after the Battle of Sekigahara, his vassals stayed in Higo Province (Kumamoto Prefecture). Muneshige wrote this letter to a leader of his vassals, Ono Shigeyuki, asking him to send his gratitude to boatmen who were also staying in Higo Province with Muneshige’s vassals for a long time.