While not accurate for John Egan's actual evasion and capture in Germany, the experiences shown by his character in this episode were very strongly based on the actual incident named the Russelsheim Massacre, where six American airmen were executed by an angry mob of German civilians, while their two armed guards stood by idle. One uniformed air warden, armed with a semi-automatic pistol, emptied his magazine while shooting all six in the head to ensure they were dead. The incident started when two German women called the airmen, "terror flyers," and one threw a brick to the head of an airman.
Finally, again as portrayed, those airmen who failed to escape were taken by a cart to a nearby cemetery and buried in a mass grave. One event that happened in reality, but not portrayed in the scene was that an air raid siren sounded off at the height of the violence, causing the mob to stop and flee in fear. This allowed two of the six airmen to escape. Their reports were integral to the post-war investigation.
The American prosecutor was Lt. Col. Leon Jaworski, who was the special prosecutor in the Watergate hearing. He insisted on individual accountability for war crimes and secured eight convictions with one acquittal. Six German civilians and the air warden were sentenced to death. The two others were sentenced to 15 and 25 years in prison. One of the death sentences was later commuted to 30 years of hard labor, and the other five were hanged.