Information: Wikipedia

A Stolperstein literally "stumbling stone", metaphorically a "stumbling block" is a sett-size, 10 by 10 centimetres (3.9 in × 3.9 in) concrete cube bearing a brass plate inscribed with the name and life dates of victims of Nazi extermination or persecution.

The Stolpersteine project, initiated by the German artist Gunter Demnig in 1992, aims to commemorate individuals at exactly the last place of residency—or, sometimes, work—which was freely chosen by the person before he or she fell victim to Nazi terror, euthanasia, eugenics, was deported to a concentration or extermination camp, or escaped persecution by emigration or suicide. As of 29 March 2018, over 67,000 Stolpersteine have been laid in 22 countries, making the Stolpersteine project the world's largest decentralized memorial.

The majority of Stolpersteine commemorate Jewish victims of the Holocaust. Others have been placed for Sinti and Romani people (then also called "gypsies"), homosexuals, the physically or mentally disabled, Jehovah's Witnesses, black people, members of the Communist Party, the Social Democratic Party, and the anti-Nazi Resistance, the Christian opposition (both Protestants and Catholics), and Freemasons, along with International Brigade soldiers in the Spanish Civil War, military deserters, conscientious objectors, escape helpers, capitulators, "habitual criminals", looters, and others charged with treason, military disobedience, or undermining the Nazi military, as well as Allied soldiers.

Alice Cerf, born 23 September 1872, arrested 27 July 1944 and deported to Auschwitz by the last and XXVIth convoy.

The XXVIIth convoy was planned by the Germans, but the liberation of Brussels by the Allies prevented the departure of this convoy.

Lucie BEHR, born June 24, 1871 and her husband Lucien BEHR, born October 4, 1869 and Rabbi in Arlon, were arrested on March 20, 1943. Transferred to Mechelen and deported by the 20th convoy of April 19, 1943.  

Mr. and Mrs. BEHR-HOENEL were well known and appreciated by the Arlones.

Camille, born August 18 1882, and her sister Irma Cahen, born October 7 1878, were arrested on February 18 1943 and transferred to the Dossin barracks in Mechelen where they stayed for 2 months. On 19 April 1943 expelled by the XXth convoy and murdered in Auschwitz.

Gisela Shabes-Teichner, born in Poland on June 24, 1904. Arrested on February 12, 1943 and taken to the Dossin barracks in Mechelen, deported by the XXth convoy to Auschwitz and killed there.