The 8-Inch Siege Howitzer of USS Pawnee

Two 8-Inch Siege Howitzers, Model 1841 (Olmstead et. al say "Pattern 1840") at the Washington Navy Yard.

Both were used in an attempted ambush of USS Marblehead on the Stono River on Christmas Day, 1863. One was subsequently carried as a pet aboard USS Pawnee.