Johnston, Albert Sidney was born on February 2, 1803 in Washington, Kentucky, United States. Son of Doctor John and Abigail (Harris) Johnston.
Graduated from the United States Mil Academy, 1826.
Brevetted Second lieutenant 2d Infantry, United States Army, served at Sackett’s Harbor, New York, 1826. Second in command Lieutenant, 6th Infantry at Jefferson Barracks, Missouri, 1827. Adjutant in Black Hawk War.
Resigned commission, 1834. Adjutant general Army of Texas, 1836, senior brigadier general, 1837. Secretary of war Republic of Texas, 1838-1840.
Colonel 1st Texas Rifle Volunteers and inspector general at Monterrey (Mexico) during Mexican war. Paymaster United States Army for Texas, commander Department of Texas, 1856-1858. Led expedition against Mormons, 1857.
Commander Department of Utah, 1858-1860. Commissioned brigadier general United States Army, 1858. Commander Department of Pacific, 1860.
Joined Confederate Army as general in charge of operations in West. Loss of Fort Donelson forced him to retreat, 1862. Concentrating his army around Corinth (Mississippi) attacked Grant at Pittsburg landing (known in North as Shiloh), April 6, 1862 (a Southern victory).
Married Henrietta Preston, January 20, 1829. Married second, Eliza Griffin, October 3, 1843.