I watched Dunkirk and at one point a Spit is tailing an He.111 and the movie sound had a rather distinct boom boom boom, which I presumed was a 30mm or 20mm cannon firing from the bomber. But I looked up the 111 on Wikipedia and found no mention of a model with a cannon in the tail.
You guys usually know more, was this an error in the film, or was there another position in the plane that could fire rearward with a cannon?
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