Tsukushi Korekado served as a bushō during the Sengoku period.

The Tsukushi clan are considered to have been descendants of Ashikaga Tadafuyu from the Nanbokuchō period or an illegitimate branch of the Shōni clan.  The Tsukushi were kokujin, or provincial landowners, and the lord of the manor of Tsukushi in the Mikasa District of Chikuzen Province.  The clan acquired power on a par with a daimyō family in Chikuzen and Hizen provinces.

There are various theories concerning the lineage of the Tsukushi clan during the Muromachi and Sengoku periods, but the details are uncertain.

In the second month of 1533, when Sue Okifusa, a senior retainer of Ōuchi Yoshitaka, invaded Chikuzen, Korekado surrendered to the Ōuchi clan.

In 1557, after the demise of the Ōuchi clan, Korekado came under the influence of the Ōtomo clan.  Meanwhile, Mōri Motonari extended his power into northern Kyūshū, and, through this connection, Korekado joined with Akizuki Fumitane to rebel.  After this effort failed, Fumitane took his own life while Korekado fled along with his lineal heir, Tsukushi Hirokado, to Yamaguchi.  Later, with the support of the Mōri clan, he returned to his original landholdings.  In 1559 and in 1564, Korekado clashed with the Ōtomo army at Samuraijima in Chikuzen.  On both occasions, he deployed a strategy credited to Shimazu Yoshihisa known as tsurinobuse whereby the forces would press ahead and then retreat to lure the enemy forward and make them vulnerable to attack from forces hiding on the flanks.

Korekado attacked from in front and behind kokujin from Chikugo who were aligned with the Ōtomo clan.  This included, on the first occasion, Monjūjo Akiharu, Satō Keibu, Hoshino Akiyasu, Inuzuka 尚家, Tajiri Tanemasu, Tajiri Tanetō, and Mugio Minbu, and, on the second occasion, Monjūjo Akitoyo and Ogawa Akimasa, thereby repelling the Ōtomo army.

In 1567, Korekado, along with Takahashi Akitane, Harada Takatane, Akizuki Tanezane, and Munakata Ujisado rebelled, clashing against the Ōtomo at Samuraijima and Yamakami Castle.  After incurring an attack by Saitō Shigezane (a retainer of the Ōtomo), the forces utilized the tsurinobuse strategy again, inflicting over 200 enemy casualties.  In the end, however, Korekado transferred headship of the clan to his son, Hirokado, and took his own life after tendering Tsukushi Hidekado as a hostage and submitting to the Ōtomo army.