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Western movie with a light shining out from a river, within a cave; An army fort is nearby; a white teen and a native teen love a soldiers daughter, possibly a canadian movie.

Hello all - i've been looking for this movie and the main detail i remember is it's set in the winter, and i think its a young union officer competing with a young native for a girls attention in a fort; and the big part i remember is they see a light shining in the river under the water and the native jumps into the river and finds a cave where someones been living... but i don't remember much else from the movie except the army fort didn't have many soldiers, i think the native boy was the scout. Thanks in advance!
asked Nov 9, 2015 in Name That Movie by sulaco2d (1 point)
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