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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