Searching for torrents of copyrighted content is not a good idea. It violates the law and can expose you to risks. You could check out popular streaming services that might have the movie available for a fee or subscription.
Well, it's hard to say. Sometimes movies or shows claim to be based on true events, but they might take a lot of creative liberties. In the case of 1BR, it's not clear if it has a direct connection to real-life events.
Definitely. Operation Mincemeat actually happened. It involved elaborate planning and had a significant impact on the war. The details of the operation have been well-documented and studied.
No, it's not. From what I know, it's just a made-up story. Maybe it takes some inspiration from real events, but it's not a direct account of something that actually happened.