The 1545âÂÂ1546 was part of a failed attempt by the Uesugi clan to regain Kawagoe Castle from the Later Hà Âjà  clan in the Sengoku period of Japan. Uesugi Tomosada of the Ogigayatsu branch of the Uesugi clan attacking Kawagoe castle, he was joined by his more powerful relative Uesugi Norimasa from Yamanouchi branch Uesugi clan, who held the post of Kantà  Kanrei, the shà Âgun's deputy in the Kantà  region by Ashikaga Haruuji, the Kantà  kubà  in Koga, and by a host of anti-Hà Âjà  daimyà  from the Kantà  region.
The eldest legitimate son of Uesugi Tomooki of à Âgigayatsu, following his father's death in 1537, though he was still a child, Uesugi Tomosada led an attack on the Later Hà Âjà  clan in the Tachibana district of Musashi province. He established himself in the temple of Kandai-ji, which he fortified as a castle. However, Hà Âjà  Ujitsuna took Kawagoe castle soon afterwards from Tomosada's uncle, Uesugi Tomonari.
In 1545, Tomosada attempt to regain the Kawagoe castle for the Uesugi clan. Tomosada allied himself with Ashikaga Haruuji and Uesugi Norimasa of Yamauchi against Hà Âjà  Ujiyasu.
In April 1546, despite an overwhelming attacking force by the Uesugi clan numbering around 80,000, the 3,000 men in Kawagoe Castle's garrison, led by Hà Âjà  Tsunashige, held off the siege until the relief force arrived. The relief force, numbering only 8,000, was led by Tsunashige's brother, Hà Âjà  Ujiyasu. The principle location of the battle was at Tà Âmyà Â-ji (Kawagoe).
Some warriors were sent by Ujiyasu to sneak past the Uesugi siege lines to inform the garrison of the relief's arrival. Though still strongly outnumbered, ninja spies informed the Hà Âjà  forces that the attackers, Ashikaga Haruuji in particular, had relaxed their vigilance due to their overconfidence in victory.
The Hà Âjà  tried a risky tactic, coordinating a night attack between the garrison and the relieving force. Going against battlefield custom, the samurai were ordered to leave behind any heavy armor, which would slow them down and perhaps reveal their position, and to not bother taking the heads of their defeated enemies. This would deny the warriors much honor, as their triumphs would not be known or recorded, but the intense loyalty of the Hà Âjà  samurai caused them to follow these orders. The tactic succeeded, Uesugi Tomosada was killed in battle, and the Hà Âjà  foiled the siege.
This Hà Âjà  victory marked the decisive turning point in the struggle for the Kanto region. The Hà Âjà  tactics which said to be "one of the most notable examples of night fighting in samurai history".
This defeat for the Uesugi would lead to the near-extinction of the family, and with Tomosada's death, the à Âgigayatsu branch came to an end.