William Thomas Trego ( 1859 - 1909 ) was an American painter. William Thomas Trego s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1725 USD for Portrait of Walter Emerson Baum, in 2004 to 42000 USD for Cavalry Charge of the Union Army in 2007 , based on the size and medium of the artwork.