In the 1524 Siege of Edo, also known as the , the Hà Âjà Â, led by Hà Âjà  Ujitsuna, besieged Edo castle, which was held by Uesugi Tomooki. Though Edo has since become the Japanese metropolis of Tokyo, it was then a more or less insignificant fishing village in the Kantà  region.
Eager to repel the attackers, Uesugi Tomooki led his warriors out of the castle to meet the Hà Âjà  in battle at the Takanawa river crossing. However, Ujitsuna led his men around the Uesugi force and attacked them from the rear. Retreating to his castle, Tomooki found that the commander of his garrison, à Âta Suketaka, had betrayed him and opened the gates to the Hà Âjà Â.
The battle marked the beginning of a seventeen-year struggle between the Hà Âjà  clans and Uesugi clans for dominance of the Kantà Â.