During the Napoleanic Wars, members of the Prussian LĂĽtzow Free Corps steal a French war chest from the house of collaborator Kerstinn, but their captain Friesen is captured and sentenced to death. But Friesen is saved by French Sergeant Fleuron and they flee the occupied city together. Kerstinn's daughter Marie is disgusted by her father's disloyalty and has also fallen in love with Friesen. When she learns about a trap that is being set for LĂĽtzow Free Corps, she sets out to warn them with the help of her father's clerk PĂĽttchen, a LĂĽtzow sympathizer.
