<human>:  Why did the Germans surrender in the movie ‘The Longest Day’?
<bot>: The Germans surrendered because they were outnumbered and outgunned. The Allies had air superiority, and they had more tanks and planes than the Germans. The German army was also under-trained and under-equipped. The German army was unable to hold off the Allied forces for long, and the German commanders knew that they would be defeated if they didn't surrender.