Information taken straight from EChang's guide: In the Battle of Yamazaki (ŽRè‚̐킢), upper version, first defeat Nakamura
Kazuuji and the guard captains on Tennouzan V‰¤ŽR. A mission will show up to
assist Matsuda Masachika towards the south. Do so by defeating Nakagawa
Kiyohide and Takayama Shigetomo. Now clear the Tennouzan of enemies quickly
before the Maeda Keiji charge or enemy reinforcements events show up about
five minutes into the battle; if you do so a supply team will appear near the
enemy commander, heading towards the cave up north; defeat the captain for the
weapon. You cannot let your guard captains on the Tennouzan die.


In order to clear that last mission, you have to have all enemies on Mount Ten-oh killed, even peons.

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