. "The Pecos Expedition was an exploratory United States military event in Texas. It began April 16, 1859, and ended August 17, 1859."@en . "Pecos Expedition"@en . . . . . "The Pecos Expedition was an exploratory United States military event in Texas. It began April 16, 1859, and ended August 17, 1859."@en . . .