Nanao's Suicide Charge

"Soldier". Nanao Hibiya recalls her last battle as a samurai in her homeland Yamatsukuni, leading the rearguard of 200 against an enemy army outnumbering them 250 times. In a last act of defiance, she leads a suicidal cavalry charge into the heart of the enemy army, and kills her way past General Souma Yoshihisa's ashigaru and one of his samurai, who barely slows her down enough for the ashigaru to surround her. As a last request, she asks for a duel against Yoshihisa's son-in-law Yasutsuna, whom she's heard is the finest swordsman of his clan -- only to be told by the furious Yoshihisa that the samurai she just killed WAS Yasutsuna. He orders the ashigaru to execute her... and they're immobilized by Western mage Theodore McFarlane, who offers to take her away from the battlefield to Kimberly Magic Academy.

Example of:
Self-Destructive Charge