Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Internment camp run by the Ustaše in Croatia during World War II
Similar to Terezin camp, the Tenja camp was not a concentration camp in its ordinary meaning of the word because it was planned to become a small settlement inhabited and governed by Jews. The decision to establish this concentration camp was made in January 1942 by Grand Župan of Baranja, Stjepan Heffer, the military and police headquarters of Baranja and city government who all planned deportation of Osijek Jews to Tenja as the final solution of Jewish question in Osijek and its surroundings.
The building of the settlement was completed in April 1942 with funds collected by Jewish municipality of Osijek Jewish Community. The camp included a building of the former envelope factory Mursa Mill used to accommodate very old and ill inmates.
Disestablishment
Around 3,000 Jewish inmates were deported from Tenja to Auschwitz and Jasenovac. The first departure of 1,700 inmates was organized on 14 August 1942, second on 18 August and remaining inmates were deported at the end of August, some of them first to Lobor concentration camp and then to Auschwitz.
References
Kenrick 2004, p. 55: "... the Ustashe-run concentration camps: Jasenovac, Stara Gradiska, Strug and Tenje."
Jacobs 2009, p. 158: "A total of twenty-six concentration camps were established on the territory of NDH, such as Drnje, Kruš cica, Surovo, Bugojno, Bijeljina, Lepoglava, Rogatica, Vlasenica, Tuzla, Tenje, and Pag, but only Jadovno, Jasenovac, and Stara Gradiška were large extermination camps."
Zlata Živaković-Kerže, (Hrvatski institut za povijest – Podružnica za povijest Slavonije, Srijema i Baranje, Slavonski Brod) OD ŽIDOVSKOG NASELJA U TENJI DO SABIRNOG LOGORA