The National Archives has launched a social media scavenger hunt to promote its new exhibit "Discovering the Civil War."

The social media campaign is launching on the National Archives main Facebook page at 12:00 p.m. EDT today.

The scavenger hunt will take place across the National Archives' social media sites, including over a dozen Facebook pages, Flickr, YouTube and Twitter.

Participants who complete the scavenger hunt and submit their answers will be put into a raffle to win four "Discovering the Civil War" T-shirts from the National Archives gift shop.

The free exhibit will open in Washington, D.C., on April 30 and run through September 6.