AdvertisementU.S. Border Agents Chased Migrants On Horseback. A Photographer Explains What He SawUpdated September 21, 2021Bill ChappellfacebookEmailA U.S. Border Patrol agent on horseback tries to stop a Haitian migrant from entering an encampment on the banks of the Rio Grande on Sunday near the international bridge in Del Rio, Texas. (AFP via Getty Images)This article was originally published on September 21, 2021.