What good points you all are making. I agree that films cannot do justice to the actuality and horrors of war for those who are the brave participants in it.
I also think that movies, especially those from the Golden Age (roughly 1934-- 1959 or thereabouts) can convey something of the feeling and flavor of any particular slice of history. As long as you are aware that these are depictions and creations of imagination, not reality, they can be pretty powerful.
In another thread I linked a movie that is my favorite portrayal of the homefront (next to "Mrs. Miniver") during World War II, David O. Selznick's "Since You Went Away". Claudette Colbert must carry on at home with her two daughters while hubby is far away at war. It's lengthy but perfectly absorbing from start to finish. It's great to watch on a rainy afternoon, or as an addition to your Christmas movie repertoire.
I dare anyone to watch this heartwarming film without blubbering like I do at so many touching, luminous scenes!
https://www.youtube.com/watch?v=OOgFefJ2Ne4