 Some American Revolutionary War history has been unearthed in Massachusetts. Archaeologists working at Minuteman Park near Boston have discovered five musket balls they believe were used at the start of the Battles of Lexington and Concord. Park Ranger Jared Fwas. Being able to hold it in your hands and knowing the last person to touch this musket ball was ramming it down the barrel of their gun on the morning of April 19, 1775, it's incredible.