Statistics for occurrence #1 of “Confederate States” in chapter 14 of Brig.-Gen. Bradley T. Johnson, Confederate Military History, a library of Confederate States Military History: Volume 2.1, Maryland:

...volunteers in 1847-48. He then engaged as principal assistant engineer of the Panama division of the Isthmus railroad, and was engineer on Southern railroads until 1859. He joined the army of the Confederate States in 1861, and was commissioned brigadier-general. In February, 1862, he was charged with the inspection of Fort Henry, one of the most important defenses on the Tennessee river, and of the neighbori...
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