"Battles of Mexico, line of operations of the U.S. Army under the command of Major General Winfield Scott, on the 8th, 12th and 13th of September, 1847", map, Date Unknown; (https://texashistory.unt.edu/ark:/67531/metapth32927/m1/1/: accessed October 22, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .