Statistics for occurrence #1 of “General Henry L. Abbot” in chapter 10 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...e 6-pounder, and fine-grained cannon powder was suitable for the others. The Federal artillery paid the Confederate service the compliment of appreciating the improvements in shells, and in 1867, General Henry L. Abbot , of the Corps of Engineers, in a report on siege-ordnance used during the war, stated that there were two improvements in mortar-shells introduced by the Confederates which, in his judgment, should b...
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