Unlike many other towns, Lexington did not set aside a separate common area when the town was laid out. In 1711, the townspeople raised funds by subscription, and purchased 1.5 acres (0.61 ha) of land as a militia training ground. This was enlarged by one more acre in 1722. The common is a triangular parcel of land, bounded by Massachusetts Avenue, Bedford Street, and Harrington Road, and is located just northwest of Lexington's commercial center. The
Buckman Tavern, one of the area's busiest local taverns, stands across Bedford Street; it is also a National Historic Landmark.
On April 19, 1775, local militiamen emerged from Buckman Tavern adjacent to the common and formed two rows on the common to face arriving British troops. The militiamen suffered the first casualties of the American Revolution.--https://en.wikipedia.org/wiki/Lexington_Battle_Green