When the Japanese troops were sent to Korea for invasion in 1592, Moritomo stayed at Nagoya-jo Castle in Hizen Province, and in 1594, he made a great achievement in the construction work of Fushimi-jo Castle, which won him 10,000 koku in Mino Province.
文禄元年（1592年）の朝鮮出兵では肥前名護屋城に在陣し、文禄3年（1594年）には伏見城工事で功績を挙げたため、美濃国内に1万石を与えられた。