Despite their horror, parents had little choice but to turn over their children for deportation. Some families committed collective suicide to avoid the inevitable. The deportations slowed down, for a time, only after the purge of the ghetto was completed. Some 89,446 able-bodied prisoners remained. In October, the number of German troops was reduced, as no longer needed. The German Reserve Police Battalion 101 left the ghetto to conduct anti-Jewish operations in Polish towns with direct lines to Treblinka, Bełżec, and Sobibór. Meanwhile, a rare camp for the Christian children between 8 and 14 years of age was set up adjacent to the ghetto in December 1942, separated only by a high fence made of planks. Some 12,000–13,000 adolescent Poles with parents already dead went through the "Kinder-KZ Litzmannstadt" according to International Tracing Service. Subjected to a selection process for Germanisation, the 1,600 children performed work closely connected with the industrial output of the ghetto, with help and advice from Jewish instructors.