 During the Battle of Muar, the Imperial Guards killed 155 Australian and Indian prisoners of war in an event known as the Parit Sulong Massacre.Following the surrender of Allied forces in Singapore, Nishimura was in charge of the eastern half of Singapore Island, during the period in which the Sook Ching massacre took place.Nishimura himself was often at odds with the commander of the 25th Army, General Tomoyuki Yamashita, at times engaging in conduct that seemed deliberately insulting.