Henry Martens (after) ( 1825 - 1860 ) was a British painter. Henry Martens (after) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 76.78 USD for Night Bivouac of the British Army at Ferozshah on the 21st. Decr. 1845 in 2005 to 7085.73 USD for PORTRAIT OF A CAVALRY OFFICER in 2006 , based on the size and medium of the artwork.