The siege of Arai (æ°äºÂÃ¥ÂÂã®æ¦ãÂÂ) was among the first steps taken by Hà Âjà  Sà Âun towards becoming one of the most powerful warlords of Japan's Sengoku period. After attacking Kamakura in 1512, Hà Âjà  turned to Arai castle, on Miura Peninsula, to the south, which was controlled by Miura Yoshiatsu.
Miura Yoshiatsu's son Yoshimoto, believing defeat to be inevitable, killed himself by chopping off his own head.