Some films age well, while others get noticeably worse over the years. This film falls into the second category. First, we are asked to believe that Henry Fonda is British; please. Then, we have to subjected to Thomas Mitchell, one of the worst character actors in the history of film. He always played a mischievous Irishman; how creative.
Fonda is always good; regardless of his vehicles in film and Sullivan is believable (but not as a Brit).
The production crew made a few mistakes; like the desert being sweaty at night; it is cool in the desert at night, and unbearingly hot in the day.
This leads to a few other holes in the plot. After the crew attacks and kills a German crew, why didn't they take THEIR food and water? Duh.
Second error. Why not kill the Germans while they are sleeping instead of foraging for food and water? They would have been a lot easier to kill sleeping, rather than awake and walking around with their weapons. Sorry, no sale. Had very little to do with real desert warfare.