"Yamagata Masakage (1524 – 1575) of the Takeda clan, was famous for his red armour and skill in battlefield,
After his brother committed Seppuku(Hara-Kiri) as a cover for Takeda Yoshinobu's failed rebellion, Masakage outfitted his cavalry in bright red armor. It was said that his cavalry would always charge first in battle; sowing confusion and panic in the enemy ranks."
giant drums beating and a whole army of blood-red samurai(s) and Ashigaru(foot soldiers) charging and waving a sea of red banners...a blood curdling sight for their enemies...
"Yamagata was a fierce warrior who fought in many battles however his last was in the ill fated Battle of Nagashino where he was shot down on horse while charging together with his famous red fire unit and beheaded. All of them died together with him"