Pissing off purple in this case.
1. Take control of kyoto and claim to be the shogun,
2. backstab the fuck out of him, as well as declaring war on everyone he likes, then progressively take over all of his cities and destroy all his armies, (i did this vry quickly)
3. any regions that rebel you make them into vassal states, this gives the allied with an enemy or w/e, really pisses them off lol
at this point i had won the campaign, even ifi played domination campaign i would probably win, i just played a short campaign though
ps yes i am so good that i destroyed two armies without even slightly hurting my own two.
i lined up all my bows (about 16 ish units) and fired into the enemy with fire and significantly fucked up all his bows and infantry, he knew if he waited he was fucked so he charged, i moved my bows behind my infantry, my monks beat the shit out of them and naginata yari and horsemen on their flanks cause a mass rout, my horse units averaged around 300 kills each just from mopping up the rout