The Stalking Moon

The Stalking Moon is a 1968 western film in Technicolor starring Gregory Peck and Eva Marie Saint. It is directed by Robert Mulligan and based on the novel of the same name by T.V. Olsen.

Sam Varner Gregory Peck is a scout retiring from the Army to his ranch in New Mexico. He agrees to escort Sarah Carver Eva Marie Saint and her son after she begs him. She wants to leave immediately rather than wait five days for a military escort.Sam takes them to a stage coach stop called Hennessy. The boy runs away during the night. Varner and Sarah go looking for him as a dust storm begins. They find the boy and then hole up literally to wait out the storm. ........

Source: Wikipedia