Meet the history buffs spending years studying to become Gettysburg Battlefield guides

The Battle of Gettysburg raged from July 1 through July 3 in 1863, and was the turning point of the American Civil War. Some people spend years studying to become licensed guides at the site of the Battle of Gettysburg, but the test they need to pass is dubbed the “toughest test in American history,” as nearly 90% fail. Brook Silva-Braga met up with some of the history enthusiasts hoping to make the cut.