Source
It is nearly impossible to describe what happened for the next four and a half hours, from 5:00pm to 9:30pm, in that interrogation room. Every conceivable cruel method of blackmail was used against me to obtain by force – and at all costs – confessions and statements about comrades who had been arrested and about political activities. It began initially with that friendly “good guy” approach, as I had known some of these fellows when they were still members of Severing's Political Police (during the Weimar Republic). Thus, they cajoled me, etc., in order to discover, during the course of this playful banter, something about this or that comrade and other matters of interest to them. But the approach proved unsuccessful. This was followed by brutal attack methods, during whose process four of my teeth were knocked out of my jaw. This proved unsuccessful, too. For the third act, they tried to hypnotize me, which was completely ineffective. […] But the climax of this drama was the final act. They ordered me to take off my pants, and then two men grabbed me by the back of the neck and placed me across a footstool. A uniformed Gestapo officer with a hippopotamus-hide whip in his hand then beat my buttocks with measured strokes. Driven wild with pain, I kept screaming at the top of my lungs!
Then they held my mouth shut for a while and hit me in the face and whipped me across chest and back. Having collapsed, I writhed on the floor, always keeping my face down, and no longer replied to any of their questions. I was still given a few kicks here and there, always keeping my face covered, but I was already totally exhausted, and my chest felt so tight that I could no longer hear or see. Also, I was desperately thirsty.
Source of English translation: Doc. 3, in entry for Ernst Thälmann, in Spartacus Educational, https://spartacus-educational.com/GERthalmann.htm. © September 1997 (updated August 2014). Translation edited by GHI staff. Republished with permission from Spartacus Educational.
Source of original German text: Institute for Marxism und Leninism at the Central Committee of the SED (Socialist Unity Party), Central Party Archive, NL 3/18; reprinted Günter Hortzschansky et al., Ernst Thälmann. Eine Biographie. Berlin: Dietz Verlag, 1979, pp. 674–75.