Also released as Valley of the Swords, this lugubrious US/Spanish co-production features the usual mid-1960s "tax shelter" international cast. Broderick Crawford plays a despotic 10th century Spanish king who, in cahoots with the invading Moors, has banished handsome Castilian nobleman Spartaco Santoni. With the surreptitious aid of Crawford's daughter Teresa Velasquez, Santoni assembles an army to march against the Moors. In keeping with the 13th century epic poem from which this film was derived ("El Poema de Fernan Gonzales") Santoni's path is smoothed by the celestial intervention of patron saints Milan and Santiago. Among the big names picking up a few tax-free dollars in The Castilian are Cesar Romero, Linda Darnell, Alida Valli and Fernando Rey.

The story of two students in a school of terrorism installed in the south of France and considered a "sanctuary" and not by the Virgin of Lourdes, sent to Spain to fulfill a dark mission that failed dismally when mistaken for a priest with his link.