I'm looking for historical films that "seemingly" starts accurate and true to its events and then makes a 180 - ending off as a completely fictional story.

I'm sorry I can only think of Tarantino as prime examples (Once Upon a Time in Hollywood and Inglourious Basterds). But I'm curious with this narrative choice, why it seems to work, and how it works.

Would appreciate any suggestions and obviously this'll probably include spoilers