Gettysburg (1993) - it's a movie about the 3 day battle of Gettysburg, and while it's not a documentary, it is perhaps the most historically accurate movie ever produced. It is VERY exciting and VERY moving, especially if you've been to see the grounds where the battle was fought, because that's where it was filmed. Along with big-time actors like Martin Sheen, Jeff Daniels, Sam Elliot, & Tom Berenger, the vast majority of the cast (which is massive) was made up of reenactment actors from all over the country, which is a big part of the reason that it ended up being so accurate and so well done.
And in case war movies aren't your thing, and romantic comedies are, give
Father Goose (1964) a shot, with Cary Grant and Leslie Caron among others. I have watched both movies many times and continue to enjoy them whenever I do
~Deut