This transport includes 1742 persons, among them 523 children. The registrations started on 16 September, ended on 25 September on the eve of the departure. It took 10 days to collect the number of persons to be deported. The people must from now on be forcibly brought to the collection camp, the Jews were already in hiding. Since the big raids at the end of the summer, they left their legal address and learned the risks of going into hiding.
In Antwerp between 23 and 25 September more than 100 people are trapped by the rationing agencies on the Meir, where they collect their ration stamps. The trap of the SS-agents and their Flemish colleagues works: they keep track of all persons whose identity card has been stamped with "Jew-Juif" and with the little star, which they had collected from the city council in June. From the first day in Mechelen 162 persons registered for the 11th convoy.
A second important police action took place in the province of Hainaut. Charleroi was spared earlier in that period, but on September 24 the SS responsible for local Jewish affairs, Heinrich Knappkotter, organized a raid. He possessed a revised list of the Jews who lived in the region. The president of the local VJB (Association of Jews in Belgium) had complied with his order, but the list had been falsed. The triumvirate of the M.O.I. Charleroi, Pierre Border, Sem Makowski and Max Katz had falsified the list at night.
From the curfew the Jews were informed as much as possible of the coming raid and encouraged to go into hiding. The triumvirate immediately sets up a local protection committee for the Jews to offer help. That of the VJB, of which Max Katz is also secretary, abolished itself immediately and assigned its funds to the clandestine committee. The raid still caused a lot of damage in the city; many of the 698 people who were registered in Mechelen on 25 September came from that city.
The 11th convoy, which left the next day 26 September 1942, arrived in Auschwitz on 28 September. About 80% of the deportees - the highest number of exterminations of the entire "Belgian" deportation - were immediately killed. 1398 deportees disappeared so forever; after this massacre, 344 people were admitted and enrolled in the concentration camp. Only 34 of them survived the three years of imprisonment in the Nazi camps.
Source: The Memorial of the Deportation of the Belgian Jews, page 26.