Toyotomi odawara

I can not win toyotomi odawara battle in historical campaign. I usually lost 60 % of my army. Please how to win?

1. Welcome to the forums

2. This is from the other forum:
http://p223.ezboard.com/fshogun....0.topic
http://p223.ezboard.com/fshogun....4.topic

PS: I havent won it myself either, but havent tried it myself recently.