Twelve-pound cannon - Wikipedia

File:American Civil War era 12 lb howitzer cannon used in the

File:Cannon 12 pound manufactured at Moss Ironworks in Norway

Civil War Model 1857 12-Pounder Napoleon Field Gun 3D Model $59

QF 12-pounder 12 cwt naval gun - Wikipedia

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M1841 12-pounder howitzer - Wikipedia

10-pounder Parrott rifle - Wikipedia

Fort Smith Museum of History - Oral histories factor in to the

Napoleon cannon, Turtledove