Rubuta ci gaba don wannan sakin layi - Lokacin da Prussia ta shiga Rukunin na shida a 1813, Grolman ya yi aiki a matsayin Manjo kuma ya umurci rundunar Brandenburg Landwehr. Ya shiga cikin Yaƙin Hagelberg da kuma toshewar Magdeburg da Wesel. A watan Yulin 1814 Grolman ya koma gidansa, amma ya dauki umurnin rundunarsa ta Landwehr a shekara mai zuwa a lokacin Kwana ɗari. Domin jagorancinsa a Fleurus da Wavre
an ba shi lambar yabo ta Iron Cross Class 1.