Flag on Prospect Hill debate

According to tradition, the first flag of the United States, the Continental Union Flag (also known as "Continental Colours"), was raised by General George Washington at Prospect Hill in Somerville, Massachusetts, on 1 January 1776, in an attempt to raise the morale of the men of the Continental Army. There was a 76-foot liberty pole situated on Prospect Hill on 22 August 1775 that "was visible from most parts of the American lines, as well as from Boston".

Source: Wikipedia — Flag on Prospect Hill debate (CC BY-SA 4.0)