Mr. Seward to Mr. Adams

No. 1242.]

Sir. I enclose a copy of a letter of the 3d instant from Colonel William H. Allen, containing information in regard to. a plan for the seizure of American steamships plying on the Pacific coast. You will be pleased to take such steps in relation to the matter as may in your judgment be most conducive to the public interest.

I am, sir, your obedient servant,

WILLIAM H. SEWARD

Charles Francis Adams. Esq., &c., &c., &c.

Colonel Allen to Mr. Seward

Sir. For some time previous to the late attempt to seize the Pacific steamers, I had reason to believe that such a plan was in contemplation; the result justified my suspicions. Since then I have followed the matter up, and now have certain information that a repetition of it will be resumed on an entirely different plan. The leading agents engaged in this matter I am personally acquainted with; I therefore deem it my duty to impart to the State and Navy Departments such facts as have come to my knowledge, with an offer of any services for the purpose of counteracting the plans the parties have in view.

The plan of action now is to seize the ships by the aid of a swift but small iron steamer, armed with one gun. She will be concealed in some of the many bays and inlets abounding on the coast from the Gulf of Fonseca to San José, on the lower end of Costa Rica. Two of those vessels are now on the way, or have arrived at St. Thomas from England, in pieces. They will be put together there, or at Georgetown, Demerara, run down the coast around the Horn, intending ostensibly to ply around the Chincha islands; the officers and prize-crew will sail from this port to Havana, reporting there to Charles Helm; thence to St. Thomas, where a person named Andrews manages affairs, or did the last time. At the proper time they will proceed to San Juan, Nicaragua, where they will be taken in charge by Thomas J. Martin, late mayor of that place, who will forward them up the river, across the lake, on through Costa Rica, to the coast, there to meet the vessels and sally out at the proper time.

Helm I have known since the Mexican war; Andrews I have done business wit h Martin was in my employ while engineer on the ship canal. I am well acquainted throughout Nicaragua and Costa Rica, as also in Demerara; therefore, with the aid of an assistant and the coast natives, it would be impossible for these men to escape capture, by keeping the naval commander at Panama fully advised.

Mr. Thomas Sampson thinks as I do, that this matter is of such importance that no time should be lost in acting upon it.

Very respectfully,

WILLIAM H. ALLEN, Late Colonel 1st and 145th Regiments N. Y. Volunteers

Hon. William. H. Seward. Secretary of State.