Statistics for occurrence #1 of “Helena, Arkansas” in chapter 30 of Admiral David D. Porter, The Naval History of the Civil War.:

...my's vessels and stores. the marine brigade, its important services. operations of Lieutenant-Commander Le Roy Fitch on the Tennessee River. attack on colored troops at Milliken's bend. attack on Helena, Arkansas , by General Price. defeat of the enemy owing to the fire of the gun-boat Lexington. the raid of General John Morgan into Ohio and Indiana, and the capture of his forces owing to the energy of Lieut...
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