Instructions
Preparation
Make sure you played Kenshin's story mode through at least once. Pay attention.
Get the Matsukaze Saddle. It's essential for this battle since Kenshin is quite slow. The last part of the mission involves a time-sensitive charge to the other end of the map!
Reset his stats if you need to. Kenshin is pretty tough. Probably, you will not have to. If the enemies are too much, resetting will help.
Save and save often!
Equip Kenshin with the Matsukaze Saddle, Solar Gem, Musou Stone, Power Bracer and Himiko's Rune.
The Battle
Begin Kenshin's Kawanakajima Showdown on "hard difficulty."
Head toward Kaizu Castle and defeat Nobushige Oyamada as soon as you can move.
Ride back to Mt. Saijyo and defeat Hanzo Hattori.
Go back to Kaizu Castle and defeat Yukimura Sanada. By now, you should be glad you brought the Matsukaze. Defeat Kunoichi if you want to, but she isn't necessary.
Wait until Takeda's reinforcements come. When they do, retreat to your main camp. In response, Keiji Maeda will arrive to support Kenshin.
Charge straight into the Takeda main camp once Keiji arrives! You only have one minute once the mission appears! If you're successful, the Supply Unit will appear in Kaizu castle. Then head South.
Defeat the Supply Captain for the weapon!
Defeat Shingen Takeda to finish the stage!