Daredevil Kate (1916)

Orphaned sisters Kate and Irene are separated as children, but each keeps half of their mother's wedding ring. Years later Irene marries John West, the head of a munitions camp. Kate happens to run the saloon in the camp, and she and Irene become friends but neither ever imagines that the other is her long-lost sister. Matters take a turn for the worse, however, when Kate starts a romance with Cliff, Irene's adoptive brother, and Irene strongly disapproves of the relationship.