From my interview with Nonaka Sensei on my blog-"O-Sensei told me personally, that that was the time (The Japanese-Russo war) of his life he is most ashamed of. You know why? He killed Russians. Batto-dai. you know sword? (He) Crept up nighttime Pitch darkness. In the foxhole. You cut with the sword, (its) silent, you fire with the gun make noise. Japan was running out of metal and bullets. He never told me how many he cut …but he cut (them down)."
-- Thanks for that; it's the first report I've heard of Ueshiba Morihei killing anyone. I learn something new every day.