WASHINGTON, _March 26, 1822_. _To the Senate and House of Representatives of the United States_: Congress having suspended the appropriation, at the last session, for the fortification at Dauphine Island, in consequence of a doubt which was entertained of the propriety of that position, the further prosecution of the work was suspended, and an order given, as intimated in the message of the 3d of December, to the Board of Engineers and Naval Commissioners to examine that part of the coast, and particularly that position, as also the position at Mobile Point, with which it is connected, and to report their opinion thereon, which has been done, and which report is herewith communicated. By this report it appears to be still the opinion of the Board that the construction of works at both these positions is of great importance to the defense of New Orleans and of all that portion of our Union which is connected with and dependent on the Mississippi and on the other waters which empty into the Gulf of Mexico between that river and Cape Florida. That the subject may be fully before Congress, I transmit also a copy of the former report of the Board, being that on which the work was undertaken and has been in part executed. Approving as I do the opinion of the Board, I consider it my duty to state the reasons on which I adopted the first report, especially as they were in part suggested by the occurrences of the late war. The policy which induced Congress to decide on and provide for the defense of the coast immediately after the war was founded on the marked events of that interesting epoch. The vast body of men which it was found necessary to call into the field through the whole extent of our maritime frontier, and the number who perished by exposure, with the immense expenditure of money and waste of property which followed, were to be traced in an eminent degree to the defenseless condition of the coast. It was to mitigate these evils in future wars, and even for the higher purpose of preventing war itself, that the decision was formed to make the coast, so far as it might be practicable, impregnable, and that the measures necessary to that great object have been pursued with so much zeal since.