Warsaw, 14 April 1948. Judge Halina Wereńko, member of the District Commission for the Investigation of German Crimes in Poland, interviewed the person named below as an unsworn witness. Having been advised of the criminal liability for making false declarations, the witness testified as follows:
| Name and surname | Stefan Ubysz |
| Names of parents | Julian and Maria née Strzelczyk |
| Date of birth | 16 June 1898, Kępa-Anielin, Kozienice district |
| Religious affiliation | Roman Catholic |
| Education | Academy of Social and Political Sciences (Pedagogium) |
| Occupation | Headmaster of a common school |
| Place of residence | Warsaw, aleja Niepodległości 142, flat 5 |
The outbreak of the Warsaw Uprising found me at my flat at Kazimierzowska Street 85 in Warsaw. On 1 August 1944, at 5 p.m., insurgents attacked the school at Kazimierzowska Street 60, where a German unit had already been stationed before the Uprising, and the Stauferkaserne from the direction of Pole Mokotowskie, aleja Niepodległości and Andrzeja Boboli Street. No insurgent activities were carried out from our house and outside it tanks were moving all the time and German troops had been assembled.
On 2 August, the shooting abated somewhat. The front line ran along Narbutta Street. Before evening, the SS unit stationed at the Stauferkaserne came to our house. The SS-men ordered all the residents outside. I came out in a group of around 50 people. We were taken to the barracks (Stauferkaserne) on Rakowiecka Street. There, in the courtyard, were groups of people who had already been removed from other houses, from Rakowiecka Street (nos. 33 and 35) starting at the junction with Puławska Street all the way to aleja Niepodległości, and from other streets. After a couple of days, when the front line moved back to Narbutta Street and the neighboring streets, Patz, the commandant of the unit stationed at the barracks, addressed the people who had been brought in and said that the men would remain in the barracks as hostages, and if the Uprising continued, they would be executed. The women were released. Around 300 men were grouped in six rooms. After a few days, the men in custody were divided into two working groups and employed for removing and dismantling barricades, digging trenches and loading food, furniture and clothes onto vans. Each group was overseen by a couple of Germans.
Around 10 August (I do not remember the exact date), a German in civilian clothes, whom they called “commissar,” a fat man of below-average height and with a big face, took a dozen or so men, myself included, from the barracks. He placed us in the house at Kazimierzowska Street 85, adding us to a group of men who were still in the house, so that altogether he had around 40 laborers at his disposal. He would also make the group load clothes and furniture onto vans.
On 17 September 1944, the “commissar” took part of our group in a van to Nadarzyn, where we unloaded the furniture and clothes in a storehouse next to this German’s private flat. I do not know what happened to them later. On 17 September, he handed us over to the Todt organization in Nadarzyn. I managed to escape during the handover.
The civilians from areas around the Stauferkaserne were removed from their homes at the end of August 1944. I saw people from Lower Mokotów and Siekierki passing the barracks as they were being marched off.
Around 9 August, in the afternoon (I do not remember the exact date, but I was still at the Stauferkaserne), a Gestapo unit in a van arrived at the barracks. The Gestapo men wore uniforms; some of them wore civilian clothes, one was of senior rank. All the prisoners said that they had come from aleja Szucha. All the men were gathered in the courtyard and grouped in pairs, and one Gestapo man picked out, in my estimation, around 60 young and healthy men. Those taken away included Stanisław Ślewirzyński, Sadowski – both residents of our house – and Maurycy Jankowski. As their families told me, nobody from this group has been found.
At that the report was concluded and read out.