Statistics for occurrence #1 of “General Halleck” in chapter 16 of Admiral David D. Porter, The Naval History of the Civil War.:

...and the question was again asked: Is it possible for any of our iron clads to run the gauntlet of the batteries? But Flag-officer Foote still hesitated for reasons already given, and. furthermore, General Halleck had notified him that measures had already been taken which would compel the enemy to evacuate his works. If the gunboats were to run the batteries, Foote thought it advisable to diminish the risk ...
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