By Rene TorresSpecial to the AdvanceUlysses S. Grant, who saw action at the Battle of Palo Alto and Resaca de la Palma, in Brownsville, marched here from Corpus Christi in 1846. Exploring the South Texas frontier, where no camera had ever captured its wild nature, was an eye-opening experience for the northern boys.“There was not, at that time, a single habitation, cultivated field, or herd of domesticated animals between Corpus Christi and Matamoros,” related Grant in his memoirs.At the time of the border war, Grant was a junior officer and his input was limited to doing his job. Years later,