Cock and Bull Story

Tom and Jerry and the boys in the bar were exchanging old war stories. Tom offered one about how his grandfather led a battalion against a German division during World War I. Through brilliant manoeuvers, he defeated them and captured valuable territory. After the battle he was awarded a medal that was inscribed with:

"For Bravery, Daring and Leadership - World War I. From the Men of Battalion 8."

Jerry looked at Tom and said, "You really don't expect anyone to believe that cock and bull story, do you?" What's wrong with the story?

Answer:

World War I wasn't called "World War I" until World War II. Therefore he could not have been awarded the medal with the inscription containing the word World War I, especially just after the close of the warI. They may not possibly foresee for another world war to turn up then.