The Pandavas put Shikhandi, who had been a woman in a prior life, in front of Bhishma, as Bhishma has taken a vow not to attack a woman. Shikhandi's arrows fell on Bhishma without hindrance. Arjuna positions himself behind Shikhandi, protecting himself from Bhishma's attack and aimed his arrows at the weak points in Bhishma's armor and defeats him.
