Click on the PDF to see photos of the Colonels of the Regiment. Colonels of the Regiment PDF The Colonels of the Regiment 1st -- David Emmanuel Twiggs -- 28 Jun 1836 – 29 Jun 1846 2nd -- William Selby Harney -- 30 Jun 1846 – 14 Jun 1858 3rd -- Philip St. George Cooke -- 14 Jun 1858 …