"It was really exciting, but I also got this strange, ominous feeling, like something was telling me to go back there. I couldn't go to sleep but I was creeped out, so I didn't go."
The Battle of Gettysburg took place in July 1863. It is one of the most infamous and bloodiest battles in American history and one of the turning points of the civil war.
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The battle lasted three days and ended with more than 50,000 casualties. Four months later, President Lincoln returned to the scene of the battle to deliver his famous Gettysburg Address.
The battleground is now one of the most popular historical destinations in the US, and considered by many to be one of the most haunted places in the country.
And Yuelling now counts himself amongst those who believe in ghostly Gettysburg going ons.
"I've heard people say you can catch videos of ghosts around there," he said, "but we were so skeptical until that night.
"I always questioned the validity of those ghost videos you see on TV, I was always pretty disbelieving.
"I believe everything now."