https://www.youtube.com/watch?v=1HHcWBbR21s

She sings a general version of the song. Looking up online, there seems to be many versions of it. Her version also includes about taking someone's neck. It's not exactly folklore, but one version's lyrics even includes the stats of how many Russians were killed among other gruesome stats:

一列らんぱん破裂して　日露戦争はじまった さっさと逃げるはロシアの兵　死んでも尽くすは日本の兵 五万の兵を引き連れて　六人残して皆殺し 七月八日の戦いに　ハルピンまでも攻め寄せて クロバタキンの首を取り　東郷元帥万々歳 十一万歳ばばんざい　十二肉弾三勇士 十三寒いは北海道　十四四国の金毘羅さん 十五御殿の八重桜　十六ロウソク白いもの 十七七士の討ち入りで　十八浜辺の白兎　 十九楠正成は　二十二宮金次郎

Some super niche Japanese culture that even natives don't care much to know, perhaps dying, however gruesome the lyrics may be, I thought some of you might be interested. I was thinking maybe I should post about other older Japanese songs, maybe lullabies, or pop other songs. But I know that their eyes light up if you speak to the right audience, probably out of nostalgia.