Some suggestions...
The Duellists - first movie by Ridley Scott, adaptation of Joseph Conrad novel (itself based on real events) about two french officers duelling through all napoleonic wars
Task Force - 1949 movie with Garry Cooper, fictional account of development of US carrier tactics (I believe I've seen it available online somewhere)
A Very Long Engagement (Un long dimanche de fiançailles) - Audrey Tatou tries to find out what happened to her fiance in the trenches of the Western Front
Wild Target - I've watched this recently - british black comedy about middle-aged hitman who has second thoughts when he is contracted to kill young con artist
Layer Cake - Daniel Craig plays drug dealer and producer whose world suddenly unravels (some say that this role landed him a job as new 007)
The Bank Job - fictional account of 1971 London bank robbery
State of Play - Russel Crowe plays investigative journalist (the movie is good, but original british tv mini series is much, much better).
And if you like to watch really, really bad movies (and know polish or russian) there is Klatwa Doliny Wezy (Curse of Snakes Valley) - polish-soviet response to Indiana Jones.
Here is the most infamous scene (with russian dubbing and english subtitles), and here is
part one of the movie (in polish, all parts are available on youtube).