It's a Hungarian film, I think. Its about a priest who gets killed by a wire strung across trees while he's on his horse. Was it a children's prank gone wrong? It's black and white film. There are other pranks going on in the village.
Sounds a little like 'The White Ribbon' from 2009. https://www.imdb.com/title/tt1149362/ There's a trailer on the page. This is a movie about a north German village, close to WW I. It's directed by Michael Haneke who is an Austrian director. It's a German / Austrian production.