On 2 September I./StG 2 were credited with having devastated a large Polish Army force detraining in Piotrków Trybunalski. The "gruppe" supported the advance to Częstochowa then engaged in the Siege of Warsaw. Hitschhold's group assisted in the destruction of the Łódź Army's cavalry brigades alongside Richthofen's forces. I./StG 2 then fought in the Battle of the Bzura which destroyed Army Poznań and Army Pomorze; it bombed Polish forces in and around the Iłża forest. Hitschhold's unit then bombed rail targets in support of the Battle of Radom and Battle of Modlin. Hitschhold was appointed as "Gruppenkommandeure" (Group Commander) of I./StG 2 on 16 October 1939, ten days after the Polish capitulation.