Gen. Hugh Dunlap of Madison Parish, LA, who married Susanna McKiernan, served in the Mexican War. Actually he organized and outfitted a military unit to serve in the Mexican War. His brother-in-law, Charles B. McKiernan, an attorney in Dunlap's law firm, also served with this unit. You can "google" Charles B. McKiernan, find his epitaph (Alabama) and read some mentions of Hugh Dunlap.