If ya want to know why, it was durin' war with British; and it was flown upside-down to give Washington notice that the British was in or around the capitol so he would ride into a trap. Or somethin' to that nature. Am lookin' it up my self, so can come back with the correct information for those who would really like to know. It is for distress in time of danger, that do know. Will update soon as have more.