Site Key:    Click to Listen    Click to Print Search:      The Grand Union Flag The Grand Union Flag is available for purchase from my friends at U.S. Flag Depot, Inc. The Grand Union 1775: Also known as the Continental flag, it is the first true U.S. Flag. It combined the British King's Colours and the thirteen stripes signifying Colonial unity. George Washington liked this design so well that he chose it to be flown to celebrate the formation of the Continental Army on New Years Day, 1776. On that day the Grand Union Flag was proudly raised on Prospect Hill in Somerville, near his headquarters at Cambridge, Massachusetts.