Screaming

....‘It is not only children who would be hurt by my shout,’ Charles said. ‘Men can be sent raving mad by it; the strongest, even, would be flung to the ground. It is a magic shout that I learned from the chief devil of the Northern Territory. I took eighteen years to perfect it, and yet I have used it, in all, no more than five times.’

Richard was so confused in his mind with the dream and the handkerchief and the word spoken to Elsie that he did not know what to say, so he muttered: ‘I’ll give you fifty pounds now to clear the cromlechs with a shout.’

‘I see that you do not believe me,’ Charles said. ‘Perhaps you have never before heard of the terror shout?’

Richard considered and said: ‘Well, I have read of the hero shout which the ancient Irish warriors used, that would drive armies backwards; and did not Hector, the Trojan, have a terrible shout? And there were sudden shouts in the woods of Greece. They were ascribed to the god Pan and would infect men with a madness of fear; from this legend indeed the word “panic” has come into the English language. And I remember another shout in the Mabinogion, in the story of Lludd and Llevelys. It was a shriek that was heard on every May Eve and went through all hearts and so scared them that the men lost their hue and their strength and the women their children, and the youths and maidens their senses, and the animals and trees, the earth and the waters were left barren. But it was caused by a dragon.’

"The Shout" by Robert Graves