[3] Wrote Jeff Kinard: "The odd shape of the projectile produced a weird, unnerving shriek as it traveled through the air.

"[4] Four guns were captured by the United States Navy on the blockade-runner Princess Royal on 29 January 1863.

Two were sent to Morris Island, Charleston, South Carolina to bombard Fort Sumter during the summer of 1863.

[5] A number of 70-pounders as well as larger calibers were bought by the Imperial Brazilian Navy and used to arm some of its ironclads during the Paraguayan War in the late 1860s.

[6] British lieutenant colonel George Thompson of the Paraguayan army recorded that the Brazilians cut the fuses to the wrong length, so the shells often failed to explode.