Alarm Stone
Early on in the film one of the peasants sounds a warning concerning the Frisian raiders by blowing into a large boulder which had been adapted into some sort of horn. Every time I see that I keep thinking how fortunate it was that there was such a conveniently formed piece of stone in the area.
Does anyone know if anything similar had ever been found in reality, and was it actually somehow made (or just a fortunate result of nature)?
"I'm not reckless . . . I'm skillful!"