One by One (Spanish: Uno a uno, sin piedad) is a 1968 western film directed by Rafael R. Marchent, scored by Elsio Mancuso and starring Peter Lee Lawrence, William Bogart, Dianik Zurakowska, Eduardo Fajardo, Cris Huerta and Sidney Chaplin.

[2][5] It was released in Spain in 1969 where it sold 927,481 tickets.

[1] It was also released as One Against One... No Mercy.

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