Statistics for occurrence #1 of “Lieutenant-Commander Roe” in chapter 41 of Admiral David D. Porter, The Naval History of the Civil War.:

...essel was at that time about three or four hundred yards distant. She made for the ram, and struck her fairly With a speed of five or six knots, according to Captain Smith, or ten knots, according to Lieutenant-Commander Roe . The ram was struck just abaft her starboard-beam, causing her to heel over, and placing her after-deck under water; so much so, that Lieutenant-Commander Roe thought she was sinking. At the sa...
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