250-year-old musket balls from the "Shot Heard Round the World" battle on April 19, 1775, were discovered in Concord, Massachusetts.

250-year-old musket balls from the "Shot Heard Round the World" battle on April 19, 1775, have been discovered in Concord, Massachusetts. Archaeologists working at Minute Man National Historic Park found the musket balls, which were fired by colonial militia members during the North Bridge fight. The event marked the first time provincial militia leaders ordered their members to fire upon soldiers from their own government.