One of the bloodiest battles of the war occurred March 15, 1781 at Guilford Courthouse, North Carolina. Under American General Greene, the British inland advance was hurled back to the seacoast by the American militia units, with the British losing a quarter of their troops. Buy authentic Guilford Courthouse Flags. Our historical flags are unsurpassed in quality and authenticity. This Guilford Courthouse flag is fully printed and has 2 brass grommets on the left used for hanging. NOTE: The 4”x6” size is fully printed and mounted to a 10” staff with a gold spear top.