Admiral John Adolphus Bernard Dahlgren, between 1855 and 1865. Creator: Unknown.

Admiral John Adolphus Bernard Dahlgren, between 1855 and 1865. Creator: Unknown.

2-908-769 - Heritage Art/Heritage Images

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Adm. John A. Dahlgren, between 1855 and 1865. [Engineer and naval officer during the American Civil War: developed the Dahlgren gun; founded the naval Ordnance Department; responsible for significant advances in gunnery].

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