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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.

During the German occupation, Father Jacques committed himself to the resistance as an aid worker to people in hiding. In May 1940 he manages to smuggle a refugee French prisoner of war who is also a priest to the abbey and care for him there.

As a confessor and infirmary, Jacques can move freely among the population and this makes him a suitable contact person for the organized resistance. When a request comes from London to gather intelligence about German activities at Gilze-Rijen Air Base, Father Jacques is involved in the local branch of the Ordedienst (OD) led by Jan Magerius.

On October 10, 1942, Father Jacques is arrested by the Sicherheitsdienst (SD) at Oosterhout Abbey. In the following days, the other members of the resistance were also arrested and detained together with the father in the SD-Polizeigefängnis in Haaren. From there they are transferred to Utrecht, where the German court martial on March 31 and April 1, 1943 sentenced the entire group to death. Ultimately, four of them were commuted to deportation to Germany. Father Jacques is one of the resistance fighters who does not receive a reduced sentence. Together with resistance comrade Jan Huijbregts, he was executed on 7 May 1943 in Fort De Bilt. Father Jacques turned 46 and finds his final resting place in the cemetery of the St. Paul's Abbey in Oosterhout.

Sietze was born on March 31, 1919 in Doorn as the youngest in a Reformed family. In the autumn of 1938 he was hired by the Rijkszeedienst as an apprentice non-commissioned officer aviator for a period of six years and a probationary period of eight weeks. He was posted to De Kooij airfield in Julianadorp near Den Helder, where he obtained his pilot's license at the age of 19.

In the May days of 1940, Sietze was conscripted as a regular conscript with the 3rd Aviation Regiment. Together with the marines he fights against the Germans at the Rotterdam Maasbruggen. Fiercely anti-German as Sietze is, he refuses to hand over his weapons after the capitulation. After having worked briefly at the Construction Service, he joined the Marechaussee and was posted to Moerdijk.

In April 1941 he is transferred to Oosterhout. In the same period, Sietze joins the student resistance group around the Delft professor Jan Mekel. In the spring of 1941 the group is rolled up. As soon as Sietze became aware of this, he tried to flee to England from Gilze-Rijen airport in July 1941. However, he cannot start his device and is then arrested on the spot by the Gestapo and taken to the prison of Scheveningen, the so-called 'Oranjehotel'. Together with 85 members of the OD, the Mekel group, the Schoemaker group and 13 professional soldiers, Sytze was convicted in the Trial of the 72 that was conducted by the Sicherheitsdienst from the end of March to 3 April 1942 in hotel De Witte on the Amersfoortse Berg. SD). The trial is characterized by insults from the judges, very little legal support for the accused and ends with the death penalty for 72 of the convicted. Sietze will also receive the heaviest penalty afterwards. He probably spent the duration of the trial in camp Amersfoort. Afterwards, Sietze is transferred with the 72 to the Wehrmacht prison on the Wolvenplein in Utrecht. There, 9 sentences are converted to life imprisonment; of the other 63, including that of Sietze, the death penalty is confirmed. He is then transported by train with the convicts to the Sachsenhausen concentration camp, where he is executed on 3 May 1942 immediately upon arrival. Sietze turned 23 years old.

Ilse Johanna Behr, who was a German Jewish Catholic woman, lived as a boarder in the St. Joseph institution on the Leijsenhoek in Oosterhout, pending her emigration to Brazil. She is one of three Jewish residents who reported to the municipality in 1941. By order of the SD she was arrested by the Oosterhout police in the night of 1 to 2 August 1942. This is a retaliatory measure because a protest against the persecution of the Jews was read in Catholic churches on July 26. The Germans then detained hundreds of Catholic Jews who were taken to Westerbork and on 7 August they were deported to Auschwitz. On September 30, Ilse Behr is murdered there.