When I played Uesugi Kenshin, I put some skill point on personal fighting skill, and when I reached end of skill tree, I realized 30% increased size of general's bodyguard doesn't mean so much.
They died so fast, they were not fierce as Great guard or Yari cavalry charge. So I tried to mod on general's skill tree, but I couldn't find how.

Please give me simple introduction about it - which file(and which part) I must edit to get access on general, or agent's skill tree itself?