The Schlei and the wetlands between the Danevirke and Husum had frozen solid in a hard winter, and the territory immediately south of the Danevirke had been conquered by the advancing German army.
The Schlei and the wetlands between the Danevirke and Husum had frozen solid in a hard winter , and the territory immediately south of the Danevirke had been conquered by the advancing German army .
solid