saint george's ensign

Webster's Dictionary (1913)

a red cross on a white field with a union jack in the upper corner next the mast. It is the distinguishing badge of ships of the royal navy of England; — called also the white ensign. William Thos., and Cox, George William Brande

From the entry Saint.

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54