Royal Navy ships of the late 18th century flew the Red Ensign (above), White Ensign or Blue Ensign to designate their squadron, a practice clarified in 1864. (Thinkstock)
Thinkstock
Royal Navy ships of the late 18th century flew the Red Ensign (above), White Ensign or Blue Ensign to designate their squadron, a practice clarified in 1864. (Thinkstock)
Thinkstock