Watch Rio Grande (1950) (1950) HD Full Movie Free on SolarMovie. Watch Rio Grande (1950) (1950) online free. A cavalry officer posted on the Rio Grande is confronted with murderous raiding Apaches, a son who's...A cavalry officer posted on the Rio Grande is confronted with murderous raiding Apaches, a son who's a risk-taking recruit and his wife from whom he has been separated for many years.