The first time the patriots use artillery, the first time they sink a British ship, and the first time officers and men from different colonies stage a joint operation--the battle of Chelsea Creek, in what today are the cities of Chelsea and Revere, and the East Boston neighborhood, along an industrial waterway that still retains much of its 18th-century contour. We hear from archaeologists Craig Brown, a PhD candidate at the University of Ediburgh, and Victor Mastone, President of the Massachusetts Archaeology Society on this important, but little known May 1775 battle, and their work to map the site.