When it comes the pure grit, "The Wages of Fear" (1953) Yves Montand, Charles Vanel, Folco Lulli and Peter Van Eyck. In a nut shell, 4 guys in a decrepit South American village, are hired to transport an urgent nitroglycerine shipment without the equipment that would make it safe. It's French so it's got subtitles, so if you can't handle the subtitles don't watch it, but realize your going to miss out on a great movie. You might like the remake titled "Sorcerer" (1977) with Roy Scheider, Bruno Cremer, Francisco Rabal and Amidou more updated and a lot more action and adventure.