 Complete the following phrase:  Gersfeld is a town in the district of Fulda, in Hesse, Germany. It is situated on the Fulda River, in the Rhön Mountains, southeast of Fulda. It belonged to the abbey-principality of Fulda before secularisation in 1803. It then belonged to the Principality of Nassau-Orange-Fulda between 1803 and 1806, to France between 1806 and 1810, and then later to the Grand Duchy of Frankfurt between 1810 and 1813. After the Battle of Leipzig, it was occupied by the Allied troops of the 