name of a film

[kungfupanda1]

Im trying to find the name of a film, war film americans fighting japanese and they had to abandon this island and the guy in it had to leave his horse but didnt want to. but he had to but the horse swam out to them and they got the horse into the boat? it maybe a 50s pr 60s film.

[Brenden]

Gallant Bess - William Bendix?