Following Mueller's memo, the Gestapo in Dortmund deported the few remaining Jews still residing in Arnsberg and launched five transports for individual deportees to Theresienstadt in 1944. The first of these transports left on January 1944, and arrived in Theresienstadt on January 13. The transport consisted of only 8 Jews.
Documents from that period are scant, and so is information on that final phase of the deportation of the Jews of Dortmund. The date of departure is not certain. According to instructions given by the RSHA (Reich Security Main Office, Reichssicherheitshauptamt), the smaller transports were to make use of special cars attached to regular passengers trains, or even just a compartment within a regular passenger car. It is therefore presumed that these Jews were brought to the Dortmund-South railway station under guard and boarded a regular passenger train that went through Theresienstadt.
Upon arrival in the ghetto, the transport was designated X/4; the Roman numeral X referred to the city of Dortmund.