Samurai Warriors 4 - Battle of Sekigahara - Shimazu Version (Western Forces) | Hard 

I played this stage again because the Shimazu version of the stage is pretty different so it didn't feel right leaving it out. It even has a CG cutscene at the end of it showing what happens for a lot of people at the end of Sekigahara, and it's pretty impactful.
The stage shares similarities with the other versions, but with the Shimazu the battle goes more poorly with Sakon and Yoshitsugu going out of commission and Mitsunari gets assaulted much easier, so it's up to the Shimazu to sort everything out and GTFO.