I can also recommend The War Game[0] from the BBC.
"the effect of the film has been judged by the BBC to be too horrifying for the medium of broadcasting. It will, however, be shown to invited audiences..."
"The film eventually premiered at the National Film Theatre in London, on 13 April 1966, where it ran until 3 May.[4] It was then shown abroad at several film festivals, including the Venice one where it won the Special Prize. It also won the Academy Award for Best Documentary Feature in 1967."
"the effect of the film has been judged by the BBC to be too horrifying for the medium of broadcasting. It will, however, be shown to invited audiences..."
"The film eventually premiered at the National Film Theatre in London, on 13 April 1966, where it ran until 3 May.[4] It was then shown abroad at several film festivals, including the Venice one where it won the Special Prize. It also won the Academy Award for Best Documentary Feature in 1967."
[0] en.wikipedia.org/wiki/The_War_Game