The existence of soldiers operating in enemy territory, which is a central part of 'Inglorious Bastards', was a real - life occurrence during the war. Also, the general atmosphere of the war, the danger, and the power dynamics between the Nazis and the Allies are based on historical facts. However, things like the very specific and often extreme characters and their elaborate revenge plans are fictional.
The fact that there were commando - like units during World War II is a true - story element in 'Inglorious Bastards'. These units were sent to carry out dangerous missions behind enemy lines. But when it comes to the individual characters' backstories, like the Jew - hunter's complex and somewhat over - the - top character, that's mostly made up. The movie mixes real military operations with fictional character - driven drama.