> the same "hip-hip hooray" rally cry was used by the Red Army

Which Red Army? Unless it's the Chinese Red Army (which I have no knowledge about), but rather the Russian (Soviet) Red Army, then, firstly, the battle cry of its soldiers was not "hip-hip hooray", but rather "ura" (cognate of the English "hurrah"); and, secondly, this battle cry is much older than the Red Army. It's an old word; almost certainly a borrowing into Russian; but in which century (seventeenth? sixteenth? older?), and from which language, I do not know.

Well, this is the first time I hear "Hipp, hipp, Hurra" (the proper German version, since hurray is definetly not German) being linked to the Nazis and anti-semitism... And us Germans are rather sensitive about that