Dee ihe na-aga n'ihu maka paragraf a - Mgbe Prussia banyere na Njikọ nke Isii na 1813, Grolman jere ozi dị ka onye isi ma nye ndị agha Brandenburg Landwehr iwu. O sonyere na Agha nke Hagelberg na mgbochi nke Magdeburg na Wesel. Na July 1814 Grolman laghachiri na magistracy ya, mana were iwu nke ndị agha Landwehr ya n'afọ na-eso ya n'oge narị ụbọchị. Maka idu ndú ya na Fleurus na Wavre
e nyere ya ihe nrite Iron Cross 1st Class.