Grass: A Nation's Battle for Life is a 1925 silent documentary film which follows a branch of the Bakhtiari tribe of Persia (today Iran) as they and their herds make their seasonal journey to better pastures. It is considered one of the earliest ethnographic documentary films.

The film is a documentation of the filmmakers' journey from Angora (modern-day Ankara, Turkey) to the Bakhtiari lands of western Iran. They then follow Haidar Khan as he leads 50,000 of his people and countless animals on a harrowing trek across the Karun River and over Zard Kuh, the highest peak in the Zagros Mountains. In filming the journey, Cooper, Schoedsack, and Harrison became the first Westerners to make the migration with the Bakhtiari.

This is a restored version complete with a new Iranian score.

http://www.imdb.com/title/tt0015873/

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