Im Westen nichts Neues (All Quiet on the Western Front). A movie about WWI from the German perspective. While not 100% accurate, it does a great job of showing the harrowing trench warfare, the propaganda, and the out-of-touch militarism in the higher ranks. I highly recommend it.
A much older one: Le Grand Vadrouille (The Great Escape). A French WWII comedy about a few British pilots that need to escape occupied France. There is a little bit of English but it’s predominantly French in language. While not all movies from that age have stood the test of time (e.g. Les Gendarmes are quite racist), this one does a decent job!