How do you get Matsukaze saddle?

I haven't gotten it yet, but I do know how to get it. In Shingen Takeda's stage "Attack on Azuchi Castle" defeat Mitsuhide. Then enter the castle from the east side. Keiji will appear, literately, out of thin air. You have to defeat him within one minute from the time he appears. Right aterwards an enemy supply team will apear near Shibata's position and they will start to head towards a guy named Niwagada or something like that. If they reach Niwagada then they disappear and you have to start over again. If you have Keiji as a character then I suggest you Free Mode it. But if you have someone you're more comfortable with use them, level them up until they're maxed out, get them good skills (Like Mastery and Guts and maybe an element or two) and give it a shot. I was stuck and looked for a guide and the guide didn't really help me, so hopefully this will help you. Good luck.