Doubles as a Crowning Moment of Funny because of how he does it. Keiji casually walks right up while the two of them are engaged in a Blade Lock, grabs their wrists, and starts talking down to them like a couple of preschoolers bickering over a toy. Ieyasu just looks a bit bemused, but Mitsunari's "WTF is this guy thinking?!" expression is just priceless.
Magoichi has many, but the best is after she recovers from her Heroic BSOD.
What happens when you give an already badass character a Hyper Competent Sidekick? You get Katakura Kojuro. His military ingenuity is a match for even characters like Shingen and Hanbe. Also he routinely takes on the Big Bad's second in command allowing Masamune and Yukimura to face the main villains themselves.
Not to mention his previous fight against Fuma, when he managed to block the ninja's attack when it was bare millimeters away from stabbing him in the eye!
Masamune and Yukimura's first and second fights.
Though short, Nagamasa's fight with Masamune was still pretty epic.
Kojuro vs Mitsuhide. 100% pure win.
Chosokabe's battle with Masamune in season 2.
Not to mention Chosokabe's fight with Hideyoshi just episodes earlier. Even after getting beaten to a pulp (and nearly drowned) Motochika comes back perfectly fine and manages to give Masamune a good run for his money.
Shingen defying gravity by riding up a vertical wall on his horses, all the while standing still like a Badass!
Nohime pulling a BFG out of nowhere and proceeding to launch a rocket at Tadakatsu. Tadakatsu picks Yukimura up and flings him into the sky out of harms way. Next thing... KABOOM! Also a very sad moment.
In addition, that aforementioned rocket was launched through the ground. No explanations are given to how that works, but who cares?!
Keiji gets his in the OVA. Unable to stop Motonari from killing the soldiers he had befriended, Keiji breaks free from his bonds, attacks Motonari with his arms still tied together, dodges several volleys of arrows, fakes his own death, escapes, grabs his sword out of nowhere and proceeds to turn up just in time to stop Motochika and Motonari from killing each other. He then unleashes a cloud of sparkly Cherry Blossoms and gives a heartfelt friendship speech before heading off to fight Nobunaga. Awesome!
Toyotomi Hideyoshi parts the sea. With his fists. It has to be seen to be believed.
Also, swatting away a massive volley of arrows, and creating a ridge of rocks to stop an island-sized boat.
Speaking of the movie, the return of Oda Nobunaga is amazing, as is the battle that follows. From Yoshitsugu briefly constraining Nobunaga's Scorched Earth, to Mitsunari practically decapitating the Demon King!
Three Words: Jumping Jack Breaker!
How about these one liners right before launching a barrage of AWESOME at Oda Nobunaga?