Statistics for occurrence #1 of “Forts Jackson” in chapter 2.3 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: Volume 2.:

...ing Squadron. In the meantime the Confederates had not been idle. They had early been made acquainted with the destination of the expedition, and had put forth all their energies in strengthening Forts Jackson and St. Philip, obstructing the river, and preparing a naval force with which to meet the invaders. The ram Manassas was finished and placed in commission, and the iron-clad Louisiana, mounting six...
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