Play Battle Of Shizugatake. To obtain the Simian Sansetsu (Mibashira no Utsumiko),you must play in Hard or Chaos mode. Defeat Toshiie Maeda and convince him to retreat before Katsuie Shibata orders him to charge. You must then defeat Keiji Maeda when he charges your home base. Obviously, get over to Toshiie Maeda. Crush him before the order is given by Katsuie Shibata. You will know if you are too late and the charge order has been given if Toshiie Maeda is in Hyper mode. After you dispatch him, get back to your main base to intercept Keiji Maeda before he gets there. Wipe out inconsequential generals along the way if possible. Keep the fight with Keiji away from any of your allies because they will die in the crossfire between you and the Hyper Keiji Maeda. Bring him down and get ready to catch the supply team that will appear at the gate near Toshiie Maeda's base and move southwards.