William H. Seward to Horatio J. Perry , Esq., & c ., & c ., & c . , Madrid, October 31, 1864

Mr. Seward to Mr. Perry.

Sir:We learn unofficially that the United States ship Niagara lately overhauled and temporarily detained the Cicerone, a steamer which bore the Spanish flag. We have as yet no report of the transaction from the commander of the Niagara; but we are advised by a correspondent in London that the vessel had been described to the commander as an insurgent one recently engaged in the African slave trade, and now carrying a naval armament to the rebels. It is supposed, although not known here, that this information was, upon examination, found to be erroneous, and that the Cicerone was therefore released. I give you this information, which is all this government has received, with a desire that you shall communicate it to the Spanish government, and assure them that if any error has been committed in the transaction affecting the rights of Spain, this government will see that it is duly repaired.

I am, sir, your obedient servant,