Rubuta ci gaba don wannan sakin layi - Lokacin da aka kafa rundunar sojojin soja ta Courbiere (lambar 58) a 1797, an ba Horn umurnin daya daga cikin kamfanonin Grenadier. A lokacin da aka fara yakin 1806
, ya zama Manjo, kuma rundunarsa ta kasance wani ɓangare na sansanin Danzig. Horn ya bambanta kansa da jaruntakarsa na kare Hagelsberg a lokacin kewaye da Danzig.