 Three days after capturing Tatebayashi Castle, Ishida's forces of 23,000 troops arrived at Oshi.On arrival they discovered that the Narita clan leader, Narita Ujinaga, was at Odawara with the bulk of his forces.He had left his home castle defended by only 619 samurai and 2000 local conscripts led by his daughter Kaihime and younger brother Narita Ujichika.