Statistics for occurrence #1 of “Fort Jackson” in chapter 18 of Admiral David D. Porter, The Naval History of the Civil War.:
...on the following day, and continued without intermission until the final attack of the fleet on April 24th.
The effects of this fire are best described by Colonel Edward Higgins (the commander at Fort Jackson ), dated April 4, 1872.
Your mortar-boats were placed in position on the afternoon of the 17th of April, 1862, and opened fire at once upon Fort Jackson, where my headquarters were established.
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