'At the edge of a kris') is a 1977 Filipino action drama film directed by Cesar J. Amigo from a script by Amigo and producer Reuben Canoy.
Starring Joseph Estrada, Vic Vargas, Inez Bond Manapul and Joe Cantada, it is about a Moro rebel leader (Estrada) in a Mindanao province who is forced to fight his own brother (Vargas), a dedicated military officer.
Reuben Canoy, a writer and former mayor of Cagayan de Oro, was a supporter of the Marcos administration until 1976 when he defected to the opposition.
[3] He would also come to form in 1978 the Mindanao Alliance, a political coalition that was sympathetic to the cause of the Moro National Liberation Front (MNLF).
[4] In his 1991 book Possibilities for Peace in Southern Philippines, social scientist Nagasura Madale criticized Sa Dulo ng Kris for being "full of misconceptions and misrepresentation of the true culture, history and values of the Muslims.