Confederate Use of Captured 9-inch Dahlgren Cannon

Confederate captured several
Union 9-inch Dahlgren cannon.

Here are several reports from the Official Records of the Navy and Army.

Official Records of the Union and Confederate Navies in the War of the Rebellion.
Series I - Volume 1: The Operation of the Cruisers (January 19, 1861 - January 4, 1863)

Official Records of the Navies, Series I, Volume 1, page 302 — Operations of the Cruisers

Official Records of the Union and Confederate Navies in the War of the Rebellion.
Series I - Volume 17: Gulf Blockading Squadron (December 16, 1861 - February 21, 1862);
East Gulf Blockading Squadron (December 22, 1862 - July 17, 1865)

Official Records of the Navies, Series I, Volume 17, page 91 — Gulf Blockading Squadron

Official Records of the Union and Confederate Navies in the War of the Rebellion.
Series II - Volume 1: Statistical Data of Union and Confederate Ships; Muster Roles of Confederate Government Vessels;
Letters of Marque and Reprisals; Confederate Department Investigations.
[C.S.S. Isondiga had one 9-inch Dahlgren cannon.]

Official Records of the Navies, Series II, Volume 1, page 256 — Confederate ships data

The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate armies.
Series 1 - Volume 34 (Part I).
LOUISIANA AND THE TRANS-MISSISSIPPI.
Pages 305-306

 “SAINT LOUIS, MO., September 26, 1865.

‘…Among the pieces of artillery taken were two 9-inch

  Dahlgren guns, which were captured by the enemy, one from the

  steamer Indianola and one from the Harriet Lane...’

  A. J. SMITH,

  Maj.-Gen.

  Maj. Gen. W. T. SHERMAN.”

[These two 9-inch Dahlgren’s were later recaptured by the Union]