Lifespan: 15xx to 15xx
Titles: Governor of Aki; Lieutenant of the Right Division of Outer Palace Guards
Lord: Imagawa Yoshimoto → Tokugawa Ieyasu → Takeda Shingen → Takeda Katsuyori → Gohōjō clan
Father: Amano Fujihide
Siblings: Masatsura, Kagetsura
Amano Kagetsura served as a retainer of the Imagawa clan and lord of Inui Castle in Tōtōmi Province.
The Tōtōmi-Amano descended from the Amano associated with the Kudō of the Fujiwara-Nanke clan. From the Kamakura period, cadet families resided in Tōtōmi, Mikawa, and Aki provinces.
Kagetsura was the son of Amano Fujihide, initially serving the Imagawa of Suruga Province. In the autumn of 1547, he participated in a battle against Toda Yasumitsu at Tahara Castle in Mikawa. Yasumitsu had been assigned responsibility to escort Takechiyo (the lineal heir of the Matsudaira clan later known as Tokugawa Ieyasu) to serve as a hostage of the Imagawa in Suruga. Instead, he betrayed the Imagawa by transferring Takechiyo to their rival, the Oda of Owari. This spurred Imagawa Yoshimoto, a sengoku daimyō and the eleventh the head of the Imagawa clan, to attack Yasumitsu at Tahara, killing him and capturing the castle. Yoshimoto commended Kagetsura for his contributions on the battlefield, awarding him governance of the village of Okuyama in Tōtōmi. In 1563, Amano Kageyasu and Motokage (father and son) of the main branch of the Amano family abandoned the Imagawa, enabling Kagetsura to inherit the role as head of the Amano. While the influence of the Imagawa waned, the Tokugawa of Mikawa were on the rise, prompting Kagetsura to switch his allegiance to the Tokugawa. He then supported incursions by Tokugawa Ieyasu in Tōtōmi Province.
Following attacks by the Kai-Takeda in Tōtōmi from 1570 to 1573, Kagetsura surrendered and served in the vanguard of soldiers invading the territory of the Tokugawa. In the spring of 1571, Kagetsura came from Tōtōmi to the aid of Akiyama Torashige when efforts to advance into the Shitara District of Mikawa stalled owing to resistance led by Suganuma Sadamitsu. He led the attack against Suganuma Masasada at Nagashino Castle, during which both sides incurred significant casualties. Afterwards, a messenger from the Damine-Suganuma clan convinced Masasada reluctantly to yield to the pressure from the Takeda. Kagetsura further supported the yamaga-sanpōshū, a group of bushi from the Shitara District who cooperated with Torashige.
After the death from illness of his lord, Takeda Harunobu (Shingen), in 1573, the Takeda clan became vulnerable to attacks by the Tokugawa. Kagetsura fought valiantly before retreating from Inui Castle. Following the fall of the Kai-Takeda clan to the Oda in the third month of 1582, Kagetsura served the Gohōjō of Sagami Province and opposed the Satake clan.