Shimazu clan replied to the letter from Toyotomi Family that "they had already completed their service to Toyotomi Family", however, they could not fulfill joining the Tokugawa army both in Fuyu no Jin and Natsu no Jin (in Natsu no Jin they got information on Osaka no Eki after having left Kagoshima and arriving in Hirado City, then they returned).
島津氏は秀頼からの書状に対し「豊臣家への奉公は一度済んだ」と返事したが、徳川方としての出陣は冬の陣・夏の陣とも結果的にかなわなかった（夏の陣では、鹿児島を発ち平戸市に到着した時に大坂の役の情報を聞いて引き返している）。