In June 1941 the German army invaded Soviet Russia. In September Becker and his 227th Infantry Division were transferred to Army Group North. His was the only infantry division on the Eastern Front to have a motorized artillery battery. By December the division had become involved in fighting near Leningrad. Becker's homemade self-propelled guns of the 12th Battery proved successful. Due to its mobility, Becker's unit was used as a fire brigade to reinforce areas that were in distress.