Legionnaire from Texas

Sometimes a serving legionnaire will crack under the brutality of life in a desolate waste and then desert. But the big Texan plans to desert for his own reasons. Why has he joined the foreign legion under an assumed name? And why has an American newspaperwoman, disguised as an Arab girl, joined a caravan crossing the Sahara? When they meet and discover they both share the same secret agenda, they are unaware of their impending life and death struggle to survive ...