Statistics for occurrence #1 of “Messrs. Oltmanns” in page 218 of Admiral David D. Porter, The Naval History of the Civil War.:
...ced at this point, 2,850 yards from Fort Jackson, 3,680 from St. Philip; the vessels were then dropped in a line close to each other, their positions having been marked by the Coast Survey party, and Messrs. Oltmanns and Harris superintending personally that each one was acquainted with proper distance.
Next to Lieutenant-Commander Smith's division of seven vessels (Norfolk Packet, Lieutenant-Commander Watson S...
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† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.