Question: Henry Marshall Ashby was a Confederate States Army colonel who served under what former United States Secretary of War?

<P0-S0> Henry Marshall Ashby (1836 – July 10, 1868) was a Confederate States Army colonel during the American Civil War (Civil War). <P0-S1>  Although he commanded a brigade from June 1864 and a division at the Battle of Bentonville and through the surrender of the Confederate force under the command of General Joseph E. Johnston, he was never appointed a brigadier general by Confederate President Jefferson Davis or confirmed as a general officer by the Confederate Senate. <SEP> <P1-S0> The Confederate States Army (C.S.A.) was the military ground force of the Confederate States of America (Confederacy) during the American Civil War (1861-1865). <P1-S1>  On February 28, 1861, the Provisional Confederate Congress established a provisional volunteer army and gave control over military operations and authority for mustering state forces and volunteers to the newly chosen Confederate president, Jefferson Davis (1808-1889), a graduate of the U.S. Military Academy on the Hudson River at West Point, New York, and colonel of a volunteer regiment during the Mexican–American War (1846-1848), later a United States Senator from Mississippi and U.S. Secretary of War in the administration of 14th President Franklin Pierce (1853-1857). <P1-S2>  By March 1861, the Provisional Confederate Congress expanded the provisional forces and established a more permanent Confederate States Army. <SEP> <P2-S0> Jefferson Davis (born Jefferson Finis Davis; June 3, 1808 – December 6, 1889) was an American politician who served as the President of the Confederate States from 1861 to 1865. <P2-S1>  He was a member of the Democratic Party who represented Mississippi in the United States Senate and the House of Representatives prior to becoming president of the Confederacy. <P2-S2>  He was the 23rd United States Secretary of War, serving under U.S. President Franklin Pierce from 1853 to 1857. <SEP> <P3-S0> One of the most successful scouts in the ranks of the Federal army in Western Virginia, in the summer of 1861, was Jack (John) Cade of Marion County, Ohio, a private in Company K of the Fourth Ohio Volunteer Infantry. <P3-S1>  Soon after the regiment arrived in that section, he began to develop qualities which attracted the attention first of Col. George Leonard Andrews, his regimental Commander, and finally of General George B. McClellan himself. <P3-S2>  The latter then issued orders that "Jack" should be allowed to pass through the Federal lines, day or night, whenever he wished. <P3-S3>  He used the privilege to good advantage several times saving the Union troops from disastrous surprises. <P3-S4>  As a successful scout did he become so annoying and so well-known to the rebels that Confederate Col. Henry Marshall Ashby, offered $500 for his scalp. <P3-S5>  Jack, being anxious to see the male who was so anxious to get hold of his top knot, started out toward Petersburg, then held by the rebels, arriving at the house of a Union farmer by which Ashby was expected soon to pass. <P3-S6>  He borrowed a suit of clothiers, a horse, and a scythe from the farmer and started up the road to meet said Ashby. <P3-S7>  The latter came in sight, and Jack, with the scythe swung over his shoulder, stopped him and had a protracted conversation with him. <P3-S8>  Several times during the interview Jack was tempted to shoot Ashby with his revolver, but he suffered him to depart in peace.