Watch Duel at Diablo (1966) (1966) HD Full Movie Free on SolarMovie. Watch Duel at Diablo (1966) (1966) online free. In Apache territory, a supply Army column heads for the next fort, an ex-scout searches for the kill...In Apache territory, a supply Army column heads for the next fort, an ex-scout searches for the killer of his Indian wife, and a housewife abandons her husband in order to rejoin her Apache lover's tribe.