The Firebrand (1918)

At the time of the Russian Revolution, Princess Natalya falls in love with Julian Ross, an American of Russian descent who has been imprisoned for writing revolutionary tracts. She arranges his release, telling him that she is a governess in the home of Prince Andrei Rostoff, who is actually her uncle. Natalya's brother is killed in battle because of the treachery of Rostoff and his son Boris, allies of the German Kaiser, who provided the Russian army with faulty ammunition. For this, Julian assassinates the Rostoffs, and Natalya shoots the American in revenge. Julian, only slightly wounded, produces a document proving the Rostoffs' connections with the Kaiser, whereupon Natalya forgives him and agrees to be his wife.