Grand Union Flag depicts field
History
By the end of 1775, during the first year of the American Revolutionary War, the Second Continental Congress operated as a de facto war government, who had authorized the creation of the Continental Army, the Continental Navy, and even a small contingent of Continental Marines. A new flag was needed to represent both the Congress and the United Colonies, with a banner distinct from the British Red Ensign flown from civilian and merchant vessels, the White Ensign of the British Royal Navy, and the Flag of Great Britain carried on land by the British army. The emerging states had been using their own independent flags, with Massachusetts using the Taunton Flag, and New York using the George Rex Flag, prior to the adoption of united colors.Americans first hoisted the Grand Union Flag on the colonial warship Alfred, in the harbor on the western shore of the Delaware River at Philadelphia, Pennsylvania on 3 December 1775, under the command of the new appointed Lieutenant John Paul Jones of the formative Continental Navy. The event was documented in letters to Congress and eyewitness accounts. The flag was also used by the Continental Army forces as both a naval ensign, and as a garrison flag throughout 1776 and early 1777.It was widely believed that the flag was raised by George Washington's army on the 2 January 1776, at Prospect Hill in Charlestown (now part of Somerville), near his headquarters at Cambridge, Massachusetts, (across the Charles River to the north from Boston), which was then surrounding and laying siege to the British forces then occupying the city. It is also stated that the flag was interpreted by British military observers in the city under commanding General Thomas Gage, as a sign of surrender. However, some scholars dispute the traditional account and conclude that the flag raised at Prospect Hill was probably the flag of Great Britain, though subsequent research supports the contrary.The flag has had several names, at least five of which have been popularly remembered. The more recent moniker, "Grand Union Flag", was first applied in the 19th-century Reconstruction era by George Henry Preble, in his 1872 History of the American Flag.The Grand Union Flag became obsolete following the passing of the Flag Act of 1777 by the Continental Congress.  The new national flag replaced the Union Jack in the canton with thirteen stars (representing the thirteen States) on a field of blue. The resolution describes only a "new constellation" for the arrangement of the white stars in the blue canton, so overall designs were later interpreted and made with rows, columns, a square with one star in the center, a circle, and various other designs.