The Patrol ambushes a German courier and finds that his papers contain charts showing desert waterholes and some oases which are unknown to the Allies or the Germans. Suddenly a German patrol attacks, wounding Tully and destroying the Patrol's jeeps, water and weapons. Troy and crew strike out for a waterhole mentioned on the chart. Hours later, near their end, Troy and his men stagger toward an inviting waterhole to find it has been poisoned. On a distant dune they see Dietrich. Tully is near the end, because of his wound. It is up to Troy to negotiate with Dietrich.