Statistics for occurrence #1 of “Mobile” in chapter 7.57 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

...ay were thickly sown with stationary torpedoes, and great numbers of floating mines were sent down from above, so that the naval operations were full of danger. The Confederate torpedo service at Mobile was particularly efficient, and the lighter vessels of the Union fleet were constantly employed in sweeping for torpedoes. In the closing attacks on Fort Alexis and Spanish Fort, which resulted in ...
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Mobile (Arizona, United States) 2 0 0 0 0 user votes

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