At 3:00 pm on April 13, the Japanese army started marching from to the captured Tenguyama position and launched an attack on Odaiba. The former Shogunate Army defended Odaiba with rifles and by using the battlement as a shield, and a fierce shooting battle occurred. The Japanese army, which is superior in number, changed soldiers one after another and repeated attacks, and the Bakufu rebels, which greeted them, continued to attack them while taking breaks with two platoons taking turns. When it started to rain around sunset, the former Shogunate army put on a jacket to protect the ammunition from getting wet, and when the bullets got wet, they were put in pockets and dried. 