At the outbreak of the Mexican War, Roane was appointed Lieutenant-Colonel of the Arkansas Mounted Infantry Regiment, succeeding to command when Colonel Archibald Yell was mortally wounded repelling the charge of the Mexican lancers at the Battle of Buena Vista. Roane was officially appointed Colonel on February 28, 1847. He was known to be jealous of the honor of his state and once challenged Albert Pike to a duel over what he perceived as derogatory statements made about the regiment's actions in the war. The duel was fought, but neither combatant was injured.
American Civil War
On March 20, 1862, Roane was appointed to the grade of brigadier-general in the Confederate States Army. After most Confederate troops were moved from Arkansas across the Mississippi River, he was placed in charge of the defense of Arkansas. At this time Arkansas was nearly defenseless; and Roane, with the newly appointed commander of the Trans-Mississippi District (also known as Department Number Two), Major-General Thomas Hindman, cobbled together a reasonable defensive force. Roane took part in numerous battles within the Trans-Mississippi Theater, including the battles of Whitney's Lane and Prairie Grove.
Personal life
On February 1, 1855, Roane married Mary Kim Smith (1833–1907) of Dallas, Arkansas.
Donovan, Timothy P.; Gatewood, Willard B. Jr.; Whayne, Jeannie M., eds. (1995). The Governors of Arkansas: Essays in Political Biography (2nd ed.). Fayetteville, AR: University of Arkansas Press. ISBN1-55728-331-1.
Eicher, John H.; Eicher, David J. (June 2002), Civil War High Commands, Stanford, CA: Stanford University Press (published 2001), ISBN978-0-8047-3641-1