The Seventh Fort was the first concentration camp in Nazi-occupied territories after the beginning of the war with the Soviet Union. German orders to concentrate the Jews of Lithuania into a separate camp were received on 29 June 1941. The next day, the decision had been made during the meeting of the Lithuanian Provisional Government to set up a Jewish concentration camp in the Seventh Fort . There had been appointed newly formed Tautinio Darbo Apsaugos Batalionas (known as TDA) for camp protection and murder of its prisoners. "SS-Standartenführer" Karl Jäger, commander of "Einsatzkommando 3", was in charge of the prisoners and their executions. Up to 5,000 victims were killed in the fort's territory from 30 June 1941 until its closure on 10 August 1941. The remaining prisoners were transferred to Kaunas Ghetto. Most of them were Jewish residents of Kaunas. The largest number of victims were killed on 4 July (463 people) and 6 July (2514 people). Murdered bodies were thrown into the hole left from the half-caponier. Later other victims had been buried there too, near the fort wall. Main perpetrators of the bloody massacre were TDA battalion officers, together with their subordinates. The famous people among the victims were rabbi Elchonon Wasserman (1875–1941) and Lithuanian poet Vytautas Montvila (1902–1941).