- Country: USA
- Genres: Western
- Release: 1920-12-26
- Director: Lambert Hillyer
- Writers: William S. Hart , Lambert Hillyer
- Language: None | English
- Stars: William S. Hart , Eva Novak , Russell Gordon , Florence Carpenter , Richard Headrick , Ira McFadden
- Runtime: 60 min
- Awards: N/A
- AKA: Ulvehøvdingen (Denmark) , The Testing Block (Canada) , Le Jaguar de la Sierra (France, French Republic) , 試練台 (Japan) , Vargarna (Sweden) , The Testing Block , The Testing Block (United States of America)
- Plot: The tough outlaw 'Sierra' Bill falls in love with the traveling girl violinist Nelly Gray. Sierra forces her into marrying him. They have a child, but family life is interrupted by the gambler Ringo who not only persuades Nelly to leave her husband but ruins Sierra at the gaming table. With thoughts of vengeance, the angry Sierra breaks out of jail and goes after Ringo.
- IMDB:tt0011756
The Testing Block Cast · · · ALL
Lambert Hillyer
Director
William S. Hart
'Sierra' Bill
Eva Novak
Nelly Gray
J. Gordon Russell
Ringo
Florence Carpenter
Rosita
Richard Headrick
Sonny