The Rebel Yell, American Civil War.
This is about what only one company of Confederate soldiers would sound like. Imagine a battalion or regiment, a division or corps coming at you.
"Then arose that do-or-die expression, that maniacal maelstrom of sound; that penetrating, rasping, shrieking, blood-curdling noise that could be heard for miles and whose volume reached the heavens–such an expression as never yet came from the throats of sane men, but from men whom the seething blast of an imaginary hell would not check while the sound lasted."
— Colonel Keller Anderson of Kentucky's Orphan Brigade, CSA