I had that happen in STW, many moons ago, with 2 Daimyo fighting alone to the death. Course, there was no replay feature then .

I also had battles where I had been pushed back to one province, I think against Hojo. They had all the rest of Japan, and this was the last anti-Hojo stronghold. All my agents were dead, all I had was one full Daimyo stack of huge honour troops. I suicidally charged my soldiers forward, and they all died gloriously, no retreat. Then I charged my still fresh Daimyo and bodyguards, the last non-Hojo soldiers in Japan, straight at the enemy lines. One by one, the bodyguards fell, and eventually I was left with just my Daimyo. At 10 Honour, it took 400 Yari samurai 20 minutes to bring him down. A truly glorious end.

Haven't anything that cool in MTW yet...