frank miller didn't care about historical accuracy. he did his homework, used what he could, and ignored other things for the sake of entertainment. he just wanted to make a good comic, not a documentary. for the film, they wanted to transfer as much from the graphic novel as possible, the exact same look and feel or as close to it as they could. i'm pretty sure frank had no association with the history channel and i didn't think they matched very closely design wise either. some things were bound to match. they were based on the same event.