Literally read, "Banzai" simply means "ten thousand years"; but a battle-cry is different in kind from ordinary verbalization. Any battle-cry says nothing more than "Wah"; which unlike Banzai, has no meaning whatsoever. But just because it has no meaning, the sound of "Wah" is pregnant with inexpressibly deep feeling.
...While one still retains sufficient rationality to use words that have a meaning, one cannot be said to have reached the point of whole- or single-heartedness. No such rational element remains in a battle-cry. A battle-cry says "Wah." And in that "Wah" there is neither bad taste nor good sense. There is neither reality nor irreality. There is neither falsehood nor compromise. There's "Wah" and nothing else.