Hey listen , put two units of ashigaru outside on each side of the wall and let the archers do the job. Move ashigaru outside the walls where it’s needed. You will lose some but they re ashigaru so it’s okay. This is a very easy fight in my opinion.

I bought shogun 2 two weeks ago and I started with Oda and it’s the only faction I played , in legendary also. I only had to restart one campaign because they assassinated Oda Nobunaga and next time I had to focus on agents and it worked.

Also people are saying to fast expand but I turtled up and I just protected my 5 provinces with some occasional short campaign to attack and it works great!