What are some examples (at any time in history) of the media making a mountain out of a molehill, and how did it end?

"The Battle of the Little Bighorn" ...  is one of the most studied actions in U.S. military history, and the immense literature on the subject is devoted primarily to answering questions about Custer’s generalship during the fighting.

Neither Custer nor the 209 men in his immediate command survived the day.