The Overland Telegraph (1929)

At the beginning of the Civil War as federal troops start to build the first overland telegraph Indians who fear the wires kill some of the linesmen In response Major Hammond who oversees the troops requests that President Abraham Lincoln send twenty thousand more soldiers to come to his aid Lincoln grants Hammonds request and sends along Capt Allen who is knowledgeable about Indians At his new post Allen discovers that a Confederate spy has been fomenting trouble with the Indians Allen eventually uncovers the spy makes peace with the Indians and wins the love of Dorothy a young woman who lives at the post