"Beware of the Dog" is a 1944 World War II story by Roald Dahl which was originally published in Harper's Magazine and later appeared in his Over to You collection.
[1] RAF pilot Peter Williamson sustains a serious injury (the loss of a leg from a cannon shell) while flying a mission over German-controlled Vichy France.
As he recovers, strange things keep happening, such as hearing the sound of German warplanes through the window when none would have been nearby.
Suspicious and frightened, Williamson drags himself to the window and sees a wooden sign, "GARDE AU CHIEN" (French for “Beware of the Dog”).
When they send in a fake RAF commander to convince him to divulge his squadron's location, he stares him straight in the eye and says nothing more than "My name is Peter Williamson.