John Spencer Churchill ( 1909 - 1992 ) was a British painter. John Spencer Churchill s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 350.41 USD for Duke of Marlborough at Blenheim, 1704 in 2005 to 3200 USD for Evacuation of Dunkirk in 2015 , based on the size and medium of the artwork.