America's revolution against British rule was fought most fiercely in the Battle of Brooklyn, one of the bloodiest engagements of the entire war. The colonialists' quest for freedom was saved when the famed Maryland 400 lost their lives while stopping the Red Coats. Now, archaeologists, not far from a Catholic Church in Gowanus, are surveying a site to determine if the heroes are buried there. Tim Harfmann has the story.