This site, called "Minute Man Boulder," is associated with Lincoln Minute Man William Thorning's heroic action on April 19th, 1775.
According to local tradition, Thorning, who lived along this stretch of the Battle Road, joined in the pursuit of the British column. He encountered a flanking party of British light infantry. Dropping down into one of the farm ditches that crossed the landscape, he hid until the flanking party moved on. Thorning then ran to this rocky pasture and, sheltered behind a boulder, fired at the column again. He killed two British soldiers who are buried on a knoll across the road.