This large scale construction required a great number of stones. An analysis of their composition reveals that they came from the islands of Noko-no-shima, Itoshima, Sawara and Kashii, and the region from Noma to Teratsuka. According to old books, the stones and buildings of the dismantled Najima Castle were shipped to Fukuoka and the stones which had been used for the Genko Borui walls (walls built to thwart the Mongolian invaders) and the ancient burial mounds in and around Hirao village and the Hirao-yama hills were also reused for Fukuoka Castle. From these facts it can be inferred that the constructors of the castle had a difficult time collecting the stones. The important walls were constructed under the direction of Noguchi Sasuke Kazushige, who was renowned for his skills in construction stone walls, and who in later years participated in the construction of Edo Castle and Osaka Castle.