Flandry And The Un-Men

Dominic Flandry plans his own capture so that he can gather intelligence, then, hopefully, escape. Electronically crammed with the Urdahu language, he is:

"...weak...filthy, ill-fed, and ragged. "
-Poul Anderson, "Hunters of the Sky Cave" IN Anderson, Sir Dominic Flandry: The Last Knight Of Terra (Riverdale, NY, 2012), XII, p. 243.

However, his plan is on schedule. The enemy have obligingly taught him their language and have clearly been briefed thoroughly enough to know how to impose a new linguistic pattern on a human nervous system in hours without causing insanity.

A few Un-men allow themselves to be arrested because the capture of several identical agents should draw the leadership of the gang into one place where they can then be apprehended.

Like Flandry, the Un-men must suffer for their cause:

"[Naysmith] woke up, stripped and handcuffed, in a cell, very shortly before a team of S-men arrived to lead him away. These took the added precaution of binding his ankles before stuffing him into a jet....
"They questioned him and, since he had killed two or three of their fellows, used methods which cost him a couple of teeth and a sleepless night."
-"Un-Man," XI, p. 78.

And John le Carre's Alec Leamas spends time in an East German cell as part of a massive deception operation.

These guys don't like this stuff but can take it.