Statistics for occurrence #1 of “Fort Clifton” in chapter 11.80 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

...x on a pontoon-bridge, about 7 miles below Petersburg, and on the morning of the 9th they made their appearance in front of the left of our lines, while the Federal gun-boats opened a heavy fire upon Fort Clifton and other positions on the river. The alarm-bell was rung in the city about 9 o'clock, and every man able to shoulder a musket hurried out to the lines. Colonel F. H. Archer, a veteran of the Mex...
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