Statistics for occurrence #1 of “Brigadier General Johnson K. Duncan” in chapter 18 of Admiral David D. Porter, The Naval History of the Civil War.:

...ch siege mortar, one eight-inch siege mortar, and three pieces of light artillery. Each of the forts was garrisoned by some seven hundred men, and both, with their adjuncts, were under command of Brigadier General Johnson K. Duncan , whose gallantry and ability were conspicuous. Less current and fewer eddies existed close under the west bank, near Fort Jackson; consequently the best passage up river was in that channel. Th...
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