Transport Cl left Mlada Boleslav (Jungbunzlau) for the Theresienstadt Ghetto on 13 January 1943. It consisted of 550 Jews, residents from Mlada Boleslav and the neighboring villages. Among these were Brandys nad Labem (Brandeis), Kostelec nad Labem (Elbekosteletz), Liban, Melnik, Jicin, Neratovice (Neratowitz) and Vsetaty (Wschetat). The deportees had to report first at the gymnasium of the Masaryk school in Mladá Boleslav, which served as a collection point.
Several staff members of the Prague Jewish community Transports Department arrived in Mlada Boleslav, to carry out administrative measures according to the orders they received from the Central Office for Jewish Immigration. They prepared a list of deportees, registered Jewish property, issued notices regarding the date of deportation, and assisted in packing and carrying luggage.
The Jews were transferred from the school to the train station and put on a train. Upon arrival in Bohusovice, the deportees had to disembark and were forced to march the remaining 3 km to Theresienstadt.