Ka cika wannan jumla: Kafin Yaƙin Duniya na II, Ciechanów gida ne ga babban al'ummar Yahudawa na 1,800, amma a lokacin yaƙin
A lokacin mulkin mallaka na Nazi na Jamus, a watan Nuwamba 1942, an kwashe yawancin al'ummar Yahudawa zuwa Red Forest ("Czerwony Bór") arewa maso gabashin garin kuma aka kashe su a cikin harbi. A lokacin yaƙin yahudawan Poland da yawa da mayaƙan adawa da Jamus suka kashe a cikin gidan.